Author
Geological Survey (U.S.)
366
Audubon, John James, 1785-1851
221
De Gruyter
203
Levine, Janet
199
Adam Matthew Digital (Firm)
152
ebrary, Inc
136
National Audubon Society
119
Geological Society of America
84
Gotham Book Mart Collection (University of Pennsylvania)
84
George Clapp Vaillant Book Fund
72
United Nations Economic Commission for Europe
69
Geological Survey of Canada
61
Project Muse
61
EBSCOhost
56
Rand McNally and Company
54
Caroline F. Schimmel Collection of Women in the American Wilderness (University of Pennsylvania)
53
Smithsonian Institution
53
Alexander Street Press
52
Fiske Icelandic Collection
51
National Archives (Great Britain)
51
United States Bureau of Reclamation
49
Great Britain Colonial Office
48
United States Indian Arts and Crafts Board
48
National Wildlife Federation
47
U.S. Fish and Wildlife Service
47
Films for the Humanities & Sciences (Firm)
46
Sanson, Nicolas, 1600-1667
45
Lownes Science Collection (Brown University)
44
Films Media Group
42
Nickles, John M (John Milton), 1859-1945
42
Organisation for Economic Co-operation and Development
42
Jesuits
41
Nash, Margo
41
Rosengarten Family Fund
41
Hennepin, Louis, active 17th century
40
Moll, Herman, -1732
39
Robert Dechert Collection (University of Pennsylvania)
39
American Ornithologists' Union
37
United States National Park Service
36
Alumni and Friends Memorial Book Fund
35
Kitchin, Thomas, 1719-1784
35
L'Isle, Guillaume de, 1675-1726
35
Peterson, Roger Tory, 1908-1996
35
U.S. Coast and Geodetic Survey
35
United States Central Intelligence Agency
35
Bellin, Jacques Nicolas, 1703-1772
34
ProQuest (Firm)
34
United States Forest Service
34
Anville, Jean Baptiste Bourguignon d', 1697-1782
33
Carver, Jonathan, 1710-1780
33
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