Author
SpringerLink (Online service)
73,535
ScienceDirect (Online service)
39,580
SpringerLink (Online Service)
38,091
Geological Survey (U.S.)
30,544
Infobase,
25,809
Geological Survey (U.S.),
18,129
Literature Online (Online Service)
15,222
Oxford Scholarship Online
12,607
Films for the Humanities & Sciences (Firm)
11,841
Infobase
11,799
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10,378
EBSCOhost
7,446
United States,
3,989
United States. Bureau of Mines
3,388
Educational Resources Information Center (U.S.)
2,564
National Renewable Energy Laboratory (U.S.),
2,513
Law Library of Congress (U.S.). Global Legal Research Directorate,
2,462
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
1,699
National Renewable Energy Laboratory (U.S.)
1,687
Public Broadcasting Service (U.S.)
1,647
United States. Bureau of the Census
1,529
United States. Congress. House. Committee on the Judiciary
1,475
United States. Congress. Senate. Committee on Foreign Relations
1,474
Colorado. General Assembly. Legislative Council
1,471
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.),
1,301
United States. Forest Service,
1,301
United States. Department of State
1,275
United States. Congress. House. Committee on Natural Resources,
1,273
Colorado. Office of State Auditor
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
1,181
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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