Books in Category: Environmental Issues (sorted alphabetically)
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Mammals of Washtenaw County, Michigan Norman Asa Wood
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Mammoth Hot Springs Area: Yellowstone National Park Anonymous
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Man and Nature; Or, Physical Geography as Modified by Human Action George P. Marsh
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Many-Storied Mountains: The Life of Glacier National Park Greg Beaumont
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Meine Brüder im stillen Busch, in Luft und Wasser« (German) Martin Braess
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Memoria sobre o melhoramento da cultura da Beira e da navegação do Mondego (Portuguese) António de Almeida
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Men of the Old Stone Age: Their Environment, Life and Art Henry Fairfield Osborn
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Mensch und Erde: Skizzen von den Wechselbeziehungen zwischen beiden (German) Alfred Kirchhoff
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Mentor: Game Animals of America, Vol. 4, Num. 13, Serial No. 113, August 15, 1916 William T. Hornaday
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Mentor: Game Birds of America, Vol. 1, Num. 34, Serial No. 34 Edward Howe Forbush
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Mentor: The Story of Coal, vol. 6, Num. 6, Serial No. 154, May 1, 1918 Charles Fitzhugh Talman
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Mesa Verde [Colorado] National Park Anonymous
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Mesa Verde: Junior Ranger Booklet United States. National Park Service
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Metabolic Adaptation to Climate and Distribution of the Raccoon Procyon Lotor and Other Procyonidae John N. Mugaas, John Seidensticker, and Kathleen P. Mahlke-Johnson
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Metsät ja yhtiöt (Finnish) Kalle Kajander
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Michigan Trees: A Handbook of the Native and Most Important Introduced Species Charles Herbert Otis
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mighty deep : and what we know of it Agnes Giberne
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Migration of Birds (1950) Frederick Charles Lincoln
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Migration of Birds (1979) Frederick Charles Lincoln and Steven R. Peterson
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Migration of North American Birds (1935) Frederick Charles Lincoln
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Millions from Waste Frederick Arthur Ambrose Talbot
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Minnesota; Its Character and Climate Ledyard Bill
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Missions au Sahara, tome 1 : Sahara algérien (French) E. F. Gautier
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Modern Geography Marion I. Newbigin
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Montezuma Castle National Monument, Arizona (1959) United States. National Park Service