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R B1 Reise in die Aequinoctial-Gegenden des neuen Continents. Band 2. (German) Reise in die Aequinoctial-Gegenden des neuen Continents. Band 2. (German) Alexander von Humboldt C B1 The Complete Herbal The Complete Herbal Nicholas Culpeper O B2 The Origin of Species by Means of Natural Selection The Origin of Species by Means of Natural Selection Charles Darwin M B2 Man and Nature; Or, Physical Geography as Modified by Human Action Man and Nature; Or, Physical Geography as Modified by Human Action George P. Marsh W B1 Wealth of the World's Waste Places and Oceania Wealth of the World's Waste Places and Oceania Jewett C. Gilson N B1 The Natural History of Pliny, Volume 6 (of 6) The Natural History of Pliny, Volume 6 (of 6) the Elder Pliny C B2 Cosmos: A Sketch of the Physical Description of the Universe, Vol. 1 Cosmos: A Sketch of the Physical Description of the Universe, Vol. 1 Alexander von Humboldt W B1 Walking Walking Henry David Thoreau I B2 Influences of Geographic Environment Influences of Geographic Environment Ellen Churchill Semple G Garden Cities of To-Morrow Garden Cities of To-Morrow Sir Ebenezer Howard D Devon, Its Moorlands, Streams and Coasts Devon, Its Moorlands, Streams and Coasts Rosalind Northcote C Cape Cod Cape Cod Henry David Thoreau A American Weasels American Weasels E. Raymond Hall E Excursions Excursions Henry David Thoreau E The Extermination of the American Bison The Extermination of the American Bison William T. Hornaday V Views of nature: or Contemplations on the sublime phenomena of creation Views of nature: or Contemplations on the sublime phenomena of creation Alexander von Humboldt M Mutual Aid: A Factor of Evolution Mutual Aid: A Factor of Evolution kniaz Petr Alekseevich Kropotkin O Our Vanishing Wild Life: Its Extermination and Preservation Our Vanishing Wild Life: Its Extermination and Preservation William T. Hornaday C Conservation Reader Conservation Reader Harold W. Fairbanks O Our National Parks Our National Parks John Muir F Forest Trees of Texas: How to Know Them Forest Trees of Texas: How to Know Them Wilbur R. Mattoon and C. B. Webster M Men of the Old Stone Age: Their Environment, Life and Art Men of the Old Stone Age: Their Environment, Life and Art Henry Fairfield Osborn W Whales, dolphins, and porpoises of the western North Atlantic : a guide to their identification Whales, dolphins, and porpoises of the western North Atlantic : a guide to their identification Stephen Leatherwood, David K. Caldwell, and Howard Elliott Winn M Mount Everest, the Reconnaissance, 1921 Mount Everest, the Reconnaissance, 1921 Charles Howard-Bury, George Mallory, and A. F. R. Wollaston E Exploration of the Valley of the Amazon, Part 1 (of 2) Exploration of the Valley of the Amazon, Part 1 (of 2) William Lewis Herndon and Lardner Gibbon