United States. Bureau of Reclamation 48
EBSCOhost 24
SpringerLink (Online service) 20
Fielder, John 16
Time-Life Books 16
Center of Military History 11
ScienceDirect (Online service) 10
SpringerLink (Online Service) 10
Jackson, William Henry, 1843-1942 9
Audubon, John James, 1785-1851 8
Center of Military History, 8
Geological Survey (U.S.) 8
Jones, William C., 1937- 7
United States. National Aeronautics and Space Administration 7
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Mayhew, James, 1964- 6
Menzel, Peter, 1948- 6
Porter, Eliot, 1901-1990 6
Robinson, Christian, 6
Smith, Duane A. 6
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United States. Forest Service, 6
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Gibbon, David, 1930- 5
National Geographic Society (U.S.) 5
Smart, Ted 5
Smithsonian Institution 5
United States. National Aeronautics and Space Administration, 5
United States. Navy 5
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Buys, Christian J. 4
Collman, Russ 4
D'Aluisio, Faith, 1957- 4
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Gjernes, Marylou, 1946- 4
Henkes, Kevin, 4
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Jimenez-Reyes, Pablo, 4
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Lester, Larry 4
Lin, Grace, 4
Miller, Sammy J. 4
Mittermeier, Russell A. 4
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Rast, Everette D. 4
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United States. National Park Service 4
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Amon Carter Museum of Western Art 3
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Blum, Daniel C. 3
Cemex, S.A. de C.V. 3
Chamberlain, Samuel, 1895-1975 3
Chin, Jason, 1978- 3
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Cohen, David, 1955- 3
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Engle, Morey, 1923- 3
Fayhee, M. John, 1955- 3
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Frary, Michael, 1918- 3
Gardetto, Jessica, 3
Gianferrari, Maria, 3
Goettsch Mittermeier, Cristina 3
Gucker, Corey, 3
Hine, Lewis Wickes, 1874-1940 3
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Hunter, Kenneth E. 3
Ignotofsky, Rachel, 1989- 3
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Jackson, Billy Morrow 3
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Ketchum, Richard M., 1922-2012 3
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Lichtenheld, Tom, 3
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Martin, Fletcher, 1904-1979 3
Mathews, Alfred Edward, 1831-1874 3
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Naythons, Matthew 3
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ProQuest (Firm) 3
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Sierra Club 3