Browse Results

Showing 68,901 through 68,925 of 73,721 results

Third Generation Internet Revealed: Reinventing Computer Networks with IPv6

by Lawrence E. Hughes

This book covers the inexorable exhaustion of the IPv4 address space, the interim fix to this based on Network Address Translation (NAT) and Private Addresses, and the differences between IPv4 and IPv6. It will help you understand the limitations and problems introduced by the use of NAT and introduce you to the far simpler network and software designs possible, using a larger, unified address space.IPv6, a mature and viable replacement for IPv4, is currently used by more than 36% of all global Internet traffic. Wireless telephone service providers in many countries have migrated their networks to IPv6 with great success. The elimination of NAT and Private Addresses has vastly simplified network design and implementation. Further, there are now enough public addresses allocated to accommodate all anticipated uses for the foreseeable future. Most networking products and software, especially open-source software, are already fully IPv6 compliant. Today, no business should purchase obsolete products that support only IPv4. The global IPv6 Forum estimates that there are millions of networking professionals still needing to learn the fundamentals of IPv6 technologies to move forward. This book is for them. With plans in place for a shutdown of IPv4 on global networks (“Sunset IPv4”) the time to learn is now. If you want a job in IT, especially network hardware or software, and you don’t know IPv6, you are already obsolete. What You Will Learn This book serves as a guide to all relevant Internet Engineering Task Force (IETF) standards Request for Comments (RFCs), organized by topic and discussed in plain language Understand how IPv6 makes viable technologies such as multicast (for efficient global audio/video streaming), IPsec VPNs (for better security), and simpler VoIP Take “edge computing” to the limit by eliminating intermediary servers made necessary by IPv4 NAT–for example, making connections directly from my node to yours Discover how organizations can introduce IPv6 into existing IPv4 networks (“Dual Stack”), and then eliminate the legacy IPv4 aspects going forward (“Pure IPv6”) for the mandates going into place now (for example, US DoD requirements to move all networks to Pure IPv6)Recognize that 5G networking (the Grand Convergence of conventional networks and wireless service) depends heavily on the advanced features IPv6 Who This Book Is ForNetworking professionals. Readers should have at least some familiarity with the precursor protocol (IPv4) and legacy TCP/IP based networks. Some knowledge of network models, such as DoD four-layer model or OSI 7-layer model, is helpful to understand where the Internet Protocol fits into the larger picture. For network software developers using the Sockets API (in UNIX, Windows, etc.), this book will help you to understand the extensions to that API needed to work with IPv6.

Third Generation Solar Cells

by Agata Zdyb

This book presents the principle of operation, materials used and possible applications of third generation solar cells that are under investigation and have been not commercialized on a large scale yet. The third generation photovoltaic devices include promising emerging technologies such as: organic, dye sensitized, perovskite and quantum dot sensitized photocells. This book introduces the reader to the basics of third generation photovoltaics and presents in an accessible way phenomena and a diversity of materials used. In this book one will find the description of the working principle of new promising solar technologies, their advantages and disadvantages, prospect applications and preliminary analysis of their impact on the environment. The fundamentals of traditional solar cell operation are also included in the book facilitating understanding of new ideas. This book is ideal reading for everyone who is interested in novel solutions in photovoltaics as well as applications of nanotechnology, photochemistry and materials research.

Third Harmonic Utilization in Permanent Magnet Machines

by Kai Wang Zi-Qiang Zhu

This book investigates the utilization of harmonics in the permanent magnet (PM) or rotor shape to improve the torque density of PM brushless AC machines including three-phase inner rotor and outer rotor machines, five-phase machines, dual three-phase machines, linear machines, by means of analytical, finite element analyses, and as well as experimental validation. The torque density can be improved while the torque ripple remains low in PM shaping utilizing the 3rd harmonic. In this book, the analytical expression of output torque is derived for PM machines with rotor shape using the 3rd harmonic, and then the optimal 3rd harmonic for maximizing torque is analytically obtained. The book compares the PM shape in surface-mounted PM (SPM) machines and the rotor lamination shape in interior PM (IPM) machines utilizing the 3rd harmonic, and it becomes clear that their shaping methods and amount of torque improvement are different. In a five-phase PM machine, the 3rd harmonic can be utilized in both the current waveform and PM shapes to further improve the output torque. For the dual three-phase SPM machines without deteriorating the torque more than 30% when the optimal 3rd harmonic into both the current and PM shape are injected.The harmonics in airgap flux density have significant influence on the cogging torque, stator iron flux distribution, and radial force between the rotor and stator. These effects has been investigated as well in this book.

Third International Conference on Image Processing and Capsule Networks: ICIPCN 2022 (Lecture Notes in Networks and Systems #514)

by João Manuel R. S. Tavares Joy Iong-Zong Chen Fuqian Shi

This book provides a collection of the state-of-the-art research attempts to tackle the challenges in image and signal processing from various novel and potential research perspectives. The book investigates feature extraction techniques, image enhancement methods, reconstruction models, object detection methods, recommendation models, deep and temporal feature analysis, intelligent decision support systems, and autonomous image detection models. In addition to this, the book also looks into the potential opportunities to monitor and control the global pandemic situations. Image processing technology has progressed significantly in recent years, and it has been commercialized worldwide to provide superior performance with enhanced computer/machine vision, video processing, and pattern recognition capabilities. Meanwhile, machine learning systems like CNN and CapsNet get popular to provide better model hierarchical relationships and attempts to more closely mimic biological neural organization. As machine learning systems prosper, image processing and machine learning techniques will be tightly intertwined and continuously promote each other in real-world settings. Adopting this trend, however, the image processing researchers are faced with few image reconstruction, analysis, and segmentation challenges. On the application side, the orientation of the image features and noise removal has become a huge burden.

Third International Congress on Information and Communication Technology: ICICT 2018, London (Advances in Intelligent Systems and Computing #797)

by Xin-She Yang Nilanjan Dey Amit Joshi Simon Sherratt

The book includes selected high-quality research papers presented at the Third International Congress on Information and Communication Technology held at Brunel University, London on February 27–28, 2018. It discusses emerging topics pertaining to information and communication technology (ICT) for managerial applications, e-governance, e-agriculture, e-education and computing technologies, the Internet of Things (IOT), and e-mining. Written by experts and researchers working on ICT, the book is suitable for new researchers involved in advanced studies.

Third RILEM International Conference on Concrete and Digital Fabrication: Digital Concrete 2022 (RILEM Bookseries #37)

by Ana Blanco Richard Buswell Sergio Cavalaro Peter Kinnell

This book gathers peer-reviewed contributions presented at the 3rd RILEM International Conference on Concrete and Digital Fabrication (Digital Concrete), held in Loughborough, UK, on June 27-29, 2022. Focusing on additive and automated manufacturing technologies for the fabrication of cementitious construction materials, such as 3D concrete printing, powder bed printing, and shotcrete 3D printing, the papers highlight the latest findings in this fast-growing field, addressing topics like mixture design, admixtures, rheology and fresh-state behavior, alternative materials, microstructure, cold joints & interfaces, mechanical performance, reinforcement, structural engineering, durability and sustainability, automation and industrialization.

Third Ways: How Bulgarian Greens, Swedish Housewives, and Beer-swilling Englishmen Created Family-centered Economies--and Why They Disappeared

by Allan C. Carlson

This volume examines a very different search among some Europeans and North Americans for a Third Way, a form of social and economic organization that in important respects would be neither capitalist nor Communist. Freewheeling capitalism or collectivist communism: when it came to political-economic systems, did the twentieth century present any other choice? Does our century? InThird Ways,social historian Allan Carlson tells the story of how different thinkers from Bulgaria to Great Britain created economic systems during the twentieth century that were by intent neither capitalist nor communist. Unlike fascists, these seekers were committed to democracy and pluralism. Unlike liberal capitalists, they refused to treat human labor and relationships as commodities like any other. And unlike communists, they strongly defended private property and the dignity of persons and families. Instead, the builders of these alternative economic systems wanted to protect and renew the "natural" communities of family, village, neighborhood, and parish. They treasured rural culture and family farming and defended traditional sex roles and vital home economies. Carlson's book takes a fresh look at distributism, the controversial economic project of Hilaire Belloc and G. K. Chesterton which focused on broad property ownership and small-scale production; recovers the forgotten thought of Alexander Chayanov, a Russian economist who put forth a theory of "the natural family economy"; discusses the remarkable "third way" policies of peasant-led governments in post-World War I Bulgaria, Poland, and Romania; recounts the dramatic and largely unknown effort by Swedish housewives to defend their homes against radical feminism; relates the iconoclastic ideas of economic historian Karl Polanyi, including his concepts of "the economy without markets" and "the great transformation"; and praises the efforts by European Christian Democrats to build a moral economy on the concept ofhomo religious-"religious man. " Finally, Carlson's work explains why these efforts-at times rich in hope and prospects-ultimately failed, often with tragic results. The tale inspires wistful regret over lost opportunities that, if seized, might have spared tens of millions of lives and forestalled or avoided the blights of fascism, Stalinism, socialism, and the advent of the servile state. And yet the book closes with hope, enunciating a set of principles that could be used today for invigorating a "family way" economy compatible with an authentic, healthy, and humane culture of enterprise.

Third World Citizens and the Information Technology Revolution

by Nivien Saleh

This book challenges the widely-held view that the information technology (IT) revolution has empowered people in the Third World. Tracing the making of the global IT regime, it shows that governments and corporations of the wealthy countries dominated this process, systematically excluding representatives of low-income countries.

Third-Generation Femtosecond Technology

by Hanieh Fattahi

This thesis offers a thorough and informative study of high-power, high-energy optical parametric chirped pulse amplifications systems, the foundation of the next generation of femtosecond laser technology. Starting from the basics of the linear processes involved and the essential design considerations, the author clearly and systematically describes the various prerequisites of the nonlinear optical systems expected to drive attosecond physics in the coming decade. In this context, he gives an overview of methods for generating the broadband and carrier-envelope-phase stable seed pulses necessary for producing controlled electric-field waveforms in the final system; provides a guide to handling the high-power, high-energy pump lasers required to boost the pulse energy to the desired operating range; describes the design of the nonlinear optical system used to perform the amplification, including modes of operation for ultra-broadband infrared-visible pulses or narrowband (yet still ultrafast) pulses tunable over multiple octaves; and finally presents a prospective high-energy field synthesizer based upon these techniques. As such, this work is essential reading for all scientists interested in utilizing the newest generation of ultrafast systems.

Thirteen: The Apollo Flight That Failed

by Henry S. Cooper Jr.

An &“exciting&” minute-by-minute account of the Apollo 13 flight based on mission control transcripts from Houston (The New York Times). On the evening of April 13, 1970, the three astronauts aboard Apollo 13 were just hours from the third lunar landing in history. But as they soared through space, two hundred thousand miles from Earth, an explosion badly damaged their spacecraft. With compromised engines and failing life-support systems, the crew was in incomparably grave danger. Faced with below-freezing temperatures, a seriously ill crewmember, and a dwindling water supply, a safe return seemed unlikely.Thirteen is the shocking and miraculous true story of how the astronauts and ground crew guided Apollo 13 back to Earth. Expanding on dispatches written for the New Yorker, Henry S. F. Cooper Jr. brings readers unparalleled detail on the moment-by-moment developments of one of NASA&’s most dramatic missions.

Thirty Great Inventions of China: From Millet Agriculture to Artemisinin

by Jueming Hua Lisheng Feng

The book presents thirty great Chinese inventions, both ancient and modern, which are original, distinct, have made outstanding contributions and had extensive influence in China and around the globe. It also clarifies the misunderstandings and provides a clear definition and classification of the evaluation criteria for great inventions. Each invention is presented with color pictures and comprehensive discussions. The book not only offers readers the fascinating stories behind the greatest inventions of all time from China, such as the compass, paper, and tea making & planting, but also allows them to be inspired by the great Chinese inventors’ inherent spirit of innovation and creativity.

Thirty Years of Astronomical Discovery with UKIRT

by John Davies Andy Adamson Ian Robson

These are the proceedings of an international meeting hosted by the Royal Observatory, Edinburgh, to commemorate the 30th anniversary of the dedication of the UKIRT, the United Kingdom InfraRed Telescope. The volume comprises 31 professional level papers. The first part of the book has 10 thorough reviews of the conception, design and build of the telescope, as well as accounts of some its key instruments such as IRCAM (the common-user infrared camera), CGS4 (the fourth Cooled Grating Spectrometer) and the Wide Field Camera. The second part of the book comprises 14 reviews of scientific achievements during its twenty years of visitor mode operations. The final part of the book is a series of 7 reviews of the results from the multiple surveys being done as part of UKIDSS (UKIRT Infrared Deep Sky Survey). The authors are all experts in their respective fields, for example instrument scientists, operations staff and leading astronomers.

Thirty-Eight Witnesses: The Kitty Genovese Case

by A. M. Rosenthal

"[Rosenthal] told a stunning, tragic story and called each one of us to account for averting our eyes-- and hearts-- and voices." -Mike Wallace, 60 Minutes. It remains one of the most notorious deaths in New York City history not because of who was murdered but because of the circumstances: 28-year-old Kitty Genovese was brutally murdered, in an attack that took nearly thirty minutes and had thirty-eight witnesses... not one of whom did a thing to stop the murderer or even call for help. A.M. Rosenthal, who would later become one of the most famous and controversial editors The New York Times has ever had, was the newspaper's city editor then; the murder happened on his beat. He first published this book in 1964, the year of the murder. It is part memoir, part investigative journalism, and part public service.

This Blessed Earth: A Year In The Life Of An American Family Farm

by Ted Genoways

Is there still a place for the farm in today’s America? The family farm lies at the heart of our national identity, yet its future is in peril. Rick Hammond grew up on a small ranch, and for forty years he has raised cattle and crops on his wife’s fifth-generation homestead in York County, Nebraska, in hopes of passing it on to their four children. But as the handoff nears, their small family farm—and their entire way of life—are under siege. Rising corporate ownership of land and livestock is forcing small farmers to get bigger and bigger, assuming more debt and more risk. At the same time, after nearly a decade of record-high corn and soybean prices, the bottom has dropped out of the markets, making it ever harder for small farmers to shoulder their loans. All the while, the Hammonds are confronted by encroaching pipelines, groundwater depletion, climate change, and shifting trade policies. Far from an isolated refuge beyond the reach of global events, the family farm is increasingly at the crossroads of emerging technologies and international detente. Following the Hammonds from harvest to harvest, Ted Genoways explores this rapidly changing landscape of small, traditional farming operations, mapping as it unfolds day to day. This Blessed Earth is both a concise exploration of the history of the American small farm and a vivid, nuanced portrait of one family’s fight to preserve their legacy and the life they love.

This Book Bubbles Over: From the Ocean to Mars and Everywhere In Between

by Nora Nickum

This book really pops, full as it is of fascinating bubbles—useful and entertaining, noisy and silencing, lifesaving and dangerous, microscopic and bigger than a sports stadium.What is a bubble? A puff of air, a swirl of gas, temporarily trapped in something else. Perhaps just moments away from popping and disappearing forever.A bubble might look flimsy and insubstantial. But there&’s more to it than that.A bubble can. . .Last a long time, like the bubble wrap that cushions packagesOr pop right away, like a soap bubbleIt can be inside. . .A liquid, like boiling waterOr a solid, like a loaf of breadA bubble can be. . .Lifesaving, like firefighting foamOr dangerous, like the bubble nets whales form to capture fishDelve into bubbles in this follow-up from the team behind This Book Is Full of Holes. Filled with fascinating and unusual examples from diverse STEM fields—including physics, biology, geology, food science, and medicine—this book bubbles over with fun facts about our world.Back matter includes an author's note about the research process, language arts connections, and information about how surface tension makes fun soap bubbles possible.A Junior Library Guild Gold Standard Selection

This Book Isn't Safe

by Colin Furze

Colin Furze, five-time Guinness World Record Holder and YouTube's undisputed king of crazy inventions, instructs fans and curious young inventors on how to build ten brand new wacky inventions at home with an affordable tool kit.Colin Furze's bonkers and brilliant inventions such as a homemade hoverbike, DIY Wolverine Claws, an alarm clock ejector bed, and Hoover shoes have earned him 4.5 million YouTube subscribers and more than 450 million video views. Now Colin is on a mission to inspire a new generation of budding inventors with This Book Isn't Safe! This Book Isn't Safe contains instructions on how to make ten brand new inventions with a basic at-home toolkit, alongside behind-the-scenes stories about some of Colin's greatest inventions and top secret tips and tricks straight from his invention bunker (aka a shed in his backyard in Stamford Lincolnshire).

This Eden

by Ed O’Loughlin

“This Eden is a delight, a rollicking ride that never lets up, with a surprising — and emotionally rich — ending.” — Quill & Quire (Starred Review) Michael Atarian is out of his depth. The closest he ever came to working in tech was when he rode a delivery bike for a food app in Vancouver. Yet when his coder girlfriend dies, he is inexplicably headhunted by a sinister tech mogul and transplanted to Silicon Valley. There, a reluctant spy named Aoife lures him into the hands of an enigmatic war-gamer who tricks them both into joining his quest to save the world. Hunted by government agents and corporate goons, and manipulated at every turn, Aoife and Michael find themselves in an intercontinental chase that takes them from California to New York, from the forests of Uganda to Jerusalem, Gaza, Alexandria, and Paris, and to a final showdown with the truth in Dublin. Propulsive and richly entertaining, This Eden updates the classic spy novel for a world under mortal threat from cyber-warfare, feral money, runaway technology, and a cynical onslaught on truth itself.

This Explains Everything: 150 Deep, Beautiful, and Elegant Theories of How the World Works (Edge Question Series)

by John Brockman

Drawn from the cutting-edge frontiers of science, This Explains Everything will revolutionize your understanding of the world.What is your favorite deep, elegant, or beautiful explanation? This is the question John Brockman, publisher of Edge.org ("The world's smartest website"--The Guardian), posed to the world's most influential minds. Flowing from the horizons of physics, economics, psychology, neuroscience, and more, This Explains Everything presents 150 of the most surprising and brilliant theories of the way of our minds, societies, and universe work.Jared Diamond on biological electricity * Nassim Nicholas Taleb on positive stress * Steven Pinker on the deep genetic roots of human conflict * Richard Dawkins on pattern recognition * Nobel Prize-winning physicist Frank Wilczek on simplicity * Lisa Randall on the Higgs mechanism * BRIAN Eno on the limits of intuition * Richard Thaler on the power of commitment * V. S. Ramachandran on the "neural code" of consciousness * Nobel Prize winner ERIC KANDEL on the power of psychotherapy * Mihaly Csikszentmihalyi on "Lord Acton's Dictum" * Lawrence M. Krauss on the unification of electricity and magnetism * plus contributions by Martin J. Rees * Kevin Kelly * Clay Shirky * Daniel C. Dennett * Sherry Turkle * Philip Zimbardo * Lee Smolin * Rebecca Newberger Goldstein * Seth Lloyd * Stewart Brand * George Dyson * Matt Ridley

This Is How They Tell Me The World Ends: The Cyberweapons Arms Race

by Nicole Perlroth

This book is the product of more than seven years of interviews with more than three hundred individuals who have participated in, tracked, or been directly affected by the underground cyberarms industry. These individuals include hackers, activists, dissidents, academics, computer scientists, American and foreign government officials, forensic investigators, and mercenaries. Filled with spies, hackers, arms dealers, and a few unsung heroes, written like a thriller and a reference this book is an astonishing feat of journalism. Based on years of reporting and hundreds of interviews, the author lifts the curtain on a market in shadow, revealing the urgent threat faced by us all if we cannot bring the global cyber arms race to heel.

This Is Not A Drill: Just Another Glorious Day in the Oilfield

by Paul Carter

The outrageous sequel to Don't Tell Mum I Work on the Rigs (She Thinks I m a Piano Player in a Whorehouse) brings more great stories from the far side of civilization - hilarious, full of humour, colourful characters and dramatic action! Just another glorious day in the oilfield for Paul Carter! He s stuck in the middle of the Russian sea on a rig staffed by a crew from Azerbaijan. The choppers are older than him and can only fly by line of sight, turning back regularly due to the weather which gets particuarly interesting when they are past the point of no return with half there fuel gone and they are committed to finding the rig in a fog that s thicker than a Big Brother housemate. The closest thing to a hotel for miles around is the Asylum , a former soviet mental institution that now houses offshore personnel en-route to the rig, where his room mates are Vodka Bob - who drinks Guinness for breakfast when he s not on the rig - Sick Boy, who snores like a pit bull being hot-waxed and Sealbasher . In his inimitable style Paul Carter regales us with his colourful adventures from the front line of thee oil industry and the far side of civilization!

This Is Not the End

by Chandler Baker

If you could choose one person to bring back to life, who would it be?Seventeen-year-old Lake Deveraux is the survivor of a car crash that killed her best friend and boyfriend. Now she faces an impossible choice. Resurrection technology changed the world, but strict laws allow just one resurrection per citizen, to be used on your eighteenth birthday or lost forever.You only have days to decide.For each grieving family, Lake is the best chance to bring back their child.For Lake, it's the only way to reclaim a piece of happiness after her own family fell apart.And Lake must also grapple with a secret--and illegal--vow she made years ago to resurrect someone else. Someone who's not even dead yet.Who do you need most?As Lake's eighteenth birthday nears, secrets and betrayals new and old threaten to eclipse her cherished memories. Lake has one chance to save a life...but can she live with her choice?

This Is Rocket Science: True Stories of the Risk-taking Scientists who Figure Out Ways to Explore Beyond

by Gloria Skurzynski

..three, two, one... we have liftoff! From the award-winning author of Are We Alone? comes a title to propel young imaginations far into space. This Is Rocket Science explores the past, present, and future of space travel.The compelling text—vetted by NASA scientists—is a combination of history, science, human drama, and future challenges. Readers learn how fireworks in ancient China developed into the fire arrows used by Genghis Khan; we meet Sir Isaac Newton, Jules Verne, H.G. Wells, and learn how their imaginations shaped rocketry. We revisit the era of Sputnik, the satellite that launched a superpower space race, ending with moonwalks and a rendezvous in space. Finally we look forward to the future challenges of Mars and beyond. We also get a sneak peek at new technologies like space elevators, solar sails, ion propulsion, and more.

This Is Vegan Propaganda: (And Other Lies the Meat Industry Tells You)

by Ed Winters

Our choices can help alleviate the most pressing issues we face today: the climate crisis, infectious and chronic diseases, human exploitation and, of course, non-human exploitation. Undeniably, these issues can be uncomfortable to learn about but the benefits of doing so cannot be overstated. It is quite literally a matter of life and death. Through exploring the major ways that our current system of animal farming affects the world around us, as well as the cultural and psychological factors that drive our behaviours, This Is Vegan Propaganda answers the pressing question, is there a better way? Whether you are a vegan already or curious to learn more, this book will show you the other side of the story that has been hidden for far too long. Based on years of research and conversations with slaughterhouse workers and farmers, to animal rights philosophers, environmentalists and everyday consumers, vegan educator and public speaker Ed Winters will give you the knowledge to understand the true scale and enormity of the issues at stake. This Is Vegan Propaganda is the empowering and groundbreaking book on veganism that everyone, vegan and sceptic alike, needs to read.

This Is What It Sounds Like: What the Music You Love Says About You

by Ogi Ogas Susan Rogers

Named one of the Most Anticipated Books of 2022 by Boston Globe and Literary Hub A legendary record producer–turned–brain scientist explains why you fall in love with music. This Is What It Sounds Like is a journey into the science and soul of music that reveals the secrets of why your favorite songs move you. But it’s also a story of a musical trailblazer who began as a humble audio tech in Los Angeles, rose to become Prince’s chief engineer for Purple Rain, and then created other No. 1 hits ,including Barenaked Ladies' "One Week," as one of the most successful female record producers of all time. Now an award-winning professor of cognitive neuroscience, Susan Rogers leads readers to musical self-awareness. She explains that we each possess a unique “listener profile” based on our brain’s natural response to seven key dimensions of any song. Are you someone who prefers lyrics or melody? Do you like music “above the neck” (intellectually stimulating), or “below the neck” (instinctual and rhythmic)? Whether your taste is esoteric or mainstream, Rogers guides readers to recognize their musical personality, and offers language to describe one's own unique taste. Like most of us, Rogers is not a musician, but she shows that all of us can be musical—simply by being an active, passionate listener. While exploring the science of music and the brain, Rogers also takes us behind the scenes of record-making, using her insider’s ear to illuminate the music of Prince, Frank Sinatra, Kanye West, Lana Del Rey, and many others. She shares records that changed her life, contrasts them with those that appeal to her coauthor and students, and encourages you to think about the records that define your own identity. Told in a lively and inclusive style, This Is What It Sounds Like will refresh your playlists, deepen your connection to your favorite artists, and change the way you listen to music.

This Land: A Guide to Central National Forests

by Robert H. Mohlenbrock

A comprehensive guide to the facilities and natural features in the 43 national forests in Arkansas, Colorado, Louisiana, Minnesota, Missouri, Montana, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming.

Refine Search

Showing 68,901 through 68,925 of 73,721 results