Author
United States. National Park Service
Geological Survey (U.S.)
678
GPO MARCIVE
113
United States. Bureau of Land Management
112
Interagency Burned Area Emergency Response Team (U.S.)
97
United States. Forest Service
92
U.S. Fish and Wildlife Service
87
United States. Department of the Interior
45
United States. National Park Service. Denver Service Center
35
United States. Bureau of Reclamation
30
Billingsley, George H.
26
United States
26
America's Industrial Heritage Project
25
Unrau, Harlan D.
24
United States. Department of the Interior. Southwestern Pennsylvania Heritage Preservation Commission
23
United States. National Aeronautics and Space Administration
23
Brown, Sharon A.
20
Brock, John C.
19
Harpers Ferry Center (U.S.)
19
Junior Ranger Program (United States. National Park Service)
19
Southworth, Scott, 1957-
19
Clemensen, A. Berle
18
Petersen, James C. (James Carroll), 1952-
18
United States. Bureau of Land Management. Arizona Strip District
18
Kieffer, Susan W.
17
United States. Bureau of Indian Affairs
17
Brabets, Timothy P.
16
Chamberlain, James L. (James Luther), 1956-
16
Olmsted Center for Landscape Preservation (U.S.)
16
United States. Forest Service. Southern Research Station
16
Coastal and Marine Geology Program (Geological Survey)
14
Gibbs, Ann E.
14
Nielsen, Martha G.
14
Priest, Susan S.
14
United States. Dept. of the Interior
14
United States. Heritage Conservation and Recreation Service
14
Felger, Tracey J.
13
Parks Canada
13
Utley, Robert M., 1929-2022
13
Moring, J. Bruce (James Bruce), 1959-
12
Snell, Charles W.
12
Tilberg, Frederick, 1896-
12
United States. Army. Corps of Engineers
12
United States. General Accounting Office
12
Huber, N. King (Norman King), 1926-
11
National Recreation and Park Association
11
North Cascades National Park Service Complex (Agency : U.S.)
11
Alaska Natural History Association
10
Cochran, Susan A. (Susan Allene)
10
Fisher, Charles E. (Charles Elbert), 1947-
10
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