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- Geological Survey (U.S.)65
- United States. Congress. Joint Economic Committee29
- United States. Congress. Senate. Committee on Foreign Relations28
- United States. Environmental Protection Agency. Office of Mobile Sources. Test and Evaluation Branch22
- United States. Congress. House. Committee on Appropriations. Subcommittee on Energy and Water Development19
- Library of Congress. Congressional Research Service18
- Barth, Edward Anthony14
- United States. Congress. House. Committee on Interior and Insular Affairs12
- Emory University11
- OECD iLibrary11
- United States. Congress. House. Committee on Foreign Affairs11
- United States. Congress. House. Committee on the Judiciary11
- United States. Congress. Senate. Committee on the Judiciary11
- United States. Immigration and Naturalization Service11
- United States10
- United States. Congress. Senate. Committee on Energy and Natural Resources10
- United States. Congress. House. Committee on Energy and Commerce9
- United States. Congress. Joint Committee on Taxation9
- United States. Congressional Budget Office9
- Digitalia (Firm)8