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Author/Creator
- United States589
- United States. Congress. House261
- Library of Congress. Congressional Research Service119
- United States. Congress. Senate. Committee on Energy and Natural Resources104
- United States. General Accounting Office104
- ebrary, Inc101
- United States. Department of State80
- Project Muse63
- United States. Congress. House. Committee on Interstate and Foreign Commerce57
- United States. Geological Survey53
- Datamonitor (Firm)51
- United States. Congress. Senate50
- United States. Congress. House. Select Committee on Small Business47
- United States. Congress. Senate. Committee on Foreign Relations46
- United States. Federal Trade Commission45
- United States. Congress. House. Committee on Government Operations. Environment, Energy, and Natural Resources Subcommittee42
- United States. Congress. House. Committee on Interstate and Foreign Commerce. (1892- 1981)42
- United States. Congress. Senate. Committee on Interior and Insular Affairs42
- United States. Government Accountability Office41
- American Petroleum Institute40