Naturaleza
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The Study of Plant Life
Marie Carmichael Stopes
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Poisonous Snakes of Kansas
Robert F. Clarke
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Hertfordshire
Richard Lydekker
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Whale Primer, with Special Attention to the California Gray Whale
Theodore J. Walker
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Hiking Westward
Roger William Conant
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Audubon's western journal: 1849-1850
John Woodhouse Audubon
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The History of Malay Archipelago
Alfred Russel Wallace
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The English Lakes
William T. Palmer
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The Black Bear
William H. Wright
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The Murray River
Arthur Kinloch
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Volcanoes of the United States
Steven R. Brantley
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In Northern Mists (Vol. 1&2)
Fridtjof Nansen
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British Museum (Natural History) General Guide
British Museum
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Canyons of the Colorado
John Wesley Powell
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Colorado Outings
James W. Steele
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Following Jesus in a Warming World
Kyle Meyaard-Schaap
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Report on the Migration of Birds in the Autumn of 1879
J. A. Harvie-Brown
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Snowed Up; or, The Sportman's Club in the Mountains
Harry Castlemon
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Birds of Britain
J. Lewis Bonhote
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British Bees
William Edward Shuckard
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Reptiles del Caribe colombiano Investigación
Juan E. Carvajal-Cogollo
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Travels in a Tree-top
Charles C. Abbott
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Lassen Trails: A Brief Guide to the Trails of Lassen Volcanic National Park
Stephen Halsey Matteson
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Joe Wayring at Home; or, The Adventures of a Fly-Rod
Harry Castlemon
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The Land of Enchantment: From Pike's Peak to the Pacific
Lilian Whiting
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Grand Teton: A Guide to Grand Teton National Park, Wyoming
United States. National Park Service
