Author
SpringerLink (Online Service)
69,856
SpringerLink (Online service)
41,634
ScienceDirect (Online service)
39,641
Geological Survey (U.S.)
30,538
Infobase,
25,644
Geological Survey (U.S.),
18,125
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15,222
Oxford Scholarship Online
12,607
Films for the Humanities & Sciences (Firm)
11,840
Infobase
11,798
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10,310
EBSCOhost
7,447
United States,
3,972
United States. Bureau of Mines
3,388
Educational Resources Information Center (U.S.)
2,564
National Renewable Energy Laboratory (U.S.),
2,507
Law Library of Congress (U.S.). Global Legal Research Directorate,
2,458
United States. Congress. House. Committee on Rules
2,428
U.S. Fish and Wildlife Service
2,337
United States. National Park Service
2,205
United States. Bureau of Land Management
2,130
Prendismo, LLC (Firm)
2,123
ProQuest (Firm)
2,065
United States. Congress. Senate. Committee on Energy and Natural Resources
2,024
United States. Forest Service
1,830
Colorado State University. Cooperative Extension Service
1,778
United States. Environmental Protection Agency
1,697
National Renewable Energy Laboratory (U.S.)
1,687
Public Broadcasting Service (U.S.)
1,646
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1,529
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1,475
United States. Congress. Senate. Committee on Foreign Relations
1,474
Colorado. General Assembly. Legislative Council
1,470
National Center for Education Statistics
1,450
United States. Bureau of Reclamation
1,438
National Institute of Standards and Technology (U.S.)
1,368
U.S. Atomic Energy Commission
1,361
National Center for Health Statistics (U.S.),
1,300
United States. Forest Service,
1,300
United States. Department of State
1,275
Colorado. Office of State Auditor
1,265
United States. Congress. House. Committee on Natural Resources,
1,265
United States. Department of Health and Human Services. Office of Inspector General,
1,213
United States. Congress. House. Committee on Resources
1,209
United States. Central Intelligence Agency
1,180
United States. Congress. House. Committee on International Relations
1,169
United States. Environmental Protection Agency. Office of Water
1,159
United States. President (1993-2001 : Clinton)
1,149
United States. National Aeronautics and Space Administration
1,140
Ebooks Corporation
1,126
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