Author
Geological Survey (U.S.)
18
Geological Survey (U.S.),
11
Javersak, Jody
5
Rocky Mountain Research Station (Fort Collins, Colo.)
5
Severson, Kieth E.
5
Uresk, Daniel W.
5
Colorado. Division of Wildlife
3
United States. Congress. Senate. Committee on Energy and Natural Resources
3
Colorado. Grassland Species Working Group
2
Du Bray, E. A.,
2
Films for the Humanities & Sciences (Firm)
2
Graczyk, David J.
2
House, Leo B.
2
Hudson, Ray, 1943-
2
Hurtubise, D. O.,
2
Illinois. Division of Water Resources
2
Infobase
2
Juvenile Collection (Library of Congress)
2
Mason, Rachel, 1954-
2
National Water-Quality Assessment Program (U.S.)
2
Ruzzier, Sergio, 1966-
2
Steuer, Jeffrey J.
2
United States,
2
United States. Army. Corps of Engineers. Detroit District
2
United States. Congress. Senate. Committee on Indian Affairs (1993- ),
2
United States. National Park Service,
2
Wisconsin. Department of Natural Resources
2
Abbott, Marvin M.,
1
Ackroyd, Barry,
1
Adlesic, Trish,
1
Allyn, Rob
1
Aman, Kimiko, 1931-
1
Anderson, Wes, 1969-
1
Annapurna Pictures,
1
Appelhans, Chris,
1
BBC Worldwide Ltd
1
Ball, Zachary, 1897-1987
1
Bateman, Jason,
1
Baudouy, Michel Aimé, 1909-
1
Bauer, Marion Dane,
1
Bazian, Menachem
1
Black, Hamilton M.
1
Blackbird Films (Firm),
1
Blake, N. F.
1
Blake, Quentin,
1
Blanchard, Stephen F.,
1
Bland, John Harrington,
1
Blumhouse Productions,
1
Bondy, Sol,
1
Brett, R. L.
1
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