Geological Survey (U.S.) 4,276
SpringerLink (Online service) 1,869
United States. Government Accountability Office 914
Geological Survey (U.S.), 677
United States. Central Intelligence Agency 668
ScienceDirect (Online service) 488
United States. Government Accountability Office, 318
SpringerLink (Online Service) 296
United States. General Accounting Office 223
Oxford Scholarship Online 218
United States. Bureau of Land Management 197
EBSCOhost 190
United States. Forest Service 183
United States. Forest Service, 166
National Water-Quality Assessment Program (U.S.) 149
United States. National Park Service 140
Colorado Geological Survey 111
United States. Environmental Protection Agency 111
National Geographic Society (U.S.). Cartographic Division 104
United States. National Aeronautics and Space Administration 93
Geometronics Service Center (U.S.) 90
ProQuest (Firm) 80
United States. Bureau of Land Management, 72
United States. Department of Energy 70
United States. Bureau of Reclamation 67
California. Division of Mines and Geology 63
United States. Army. Corps of Engineers 54
Geological Survey (U.S.). Water Resources Division 50
United States. Joint Financial Management Improvement Program 47
United States. Forest Service. Southern Region 45
National Geographic Maps (Firm) 44
United States. Forest Service. Intermountain Region 44
United States. Government Printing Office 43
Water Resources Council (U.S.) 43
Colorado Water Resources Research Institute 42
United States. Forest Service. Pacific Northwest Region 42
University of Texas at Austin. Bureau of Economic Geology 41
Garver, John B., Jr 40
Shupe, John F. 39
U.S. Fish and Wildlife Service 39
Southwest Florida Water Management District (Fla.) 38
United States. Bureau of Indian Affairs 38
Colorado State University. Environmental Resources Center 37
National Operations Center (U.S.), 37
United States. Forest Service. Eastern Region 37
United States. National Park Service, 37
Geological Society of America 35
United States. National Oceanic and Atmospheric Administration 35
United States. Office of Water Resources Research 35
Colorado. General Assembly. Legislative Council 33
Montana Bureau of Mines and Geology 33
National Geographic Society (U.S.) 33
Planetary Geology and Geophysics Program (U.S.) 32
United States. Forest Service. Rocky Mountain Region 32
U.S. Atomic Energy Commission 31
United States. Soil Conservation Service 31
Carroll, Allen 30
Cobb, Edward H. 1916-1983 30
New Mexico. Bureau of Mines and Mineral Resources 30
Ebooks Corporation 29
United States. Forest Service. Southwestern Region 29
Washington (State). Department of Ecology 29
Nevada Bureau of Mines and Geology 28
Solis, William M. 28
Cold Regions Research and Engineering Laboratory (U.S.) 27
National Association for Sport and Physical Education 27
Sebastian, Steven J. 27
Society for American Baseball Research 27
United States. Government Printing Office, 27
Lepore, Brian J. 26
United States. Army. Corps of Engineers. Mississippi Valley Division, 26
Bromery, Randolph W. 1926-2013 25
Cooperative Geological Mapping Program (U.S.) 25
National Regional Aquifer Systems Analysis Program (U.S.) 25
Colorado Water Conservation Board 24
Farrell, Brenda S. 24
Kentucky Geological Survey 24
South Florida Water Management District (Fla.) 24
United States. Mississippi River Commission 24
Dicken, John E. 23
United States. Government Publishing Office, 23
Colton, Roger B. 1924- 22
Henderson, John R. 22
Minnesota Geological Survey 22
National Operations Center (U.S.) 22
National Science Foundation (U.S.) 22
United States. General Services Administration 22
Mississippi River Geomorphology and Potamology Program (U.S.), 21
National Science and Technology Center (U.S.) 21
Tennessee Valley Authority 21
Dillingham, Gerald Lee, 1947- 20
Franzel, Jeanette M. 20
Pickup, Sharon L. 20
United States. Department of Energy. Nevada Operations Office 20
United States. Forest Service. Pacific Northwest Region, 20
Arkansas Soil and Water Conservation Commission 19
Illinois State Geological Survey 19
New Jersey. Department of Environmental Protection 19
Tennessee. Division of Geology 19
United States. Federal Highway Administration 19