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- United States[remove]520
- United States. Superintendent of Documents150
- United States. National Highway Traffic Safety Administration22
- United States. Congress. Senate. Committee on Energy and Natural Resources21
- Flynn, Lois20
- United States. Federal Aviation Administration16
- Air Pollution Technical Information Center10
- United States. Department of the Army10
- United States. Bureau of Labor Statistics6
- United States. Bureau of the Census6
- United States. Environmental Protection Agency6
- United States. Environmental Protection Agency. Office of Research and Development6
- United States. Forest Service6
- United States. Office of Personnel Management. Library6
- United States. Department of State. Division of Library and Reference Services5
- United States. Department of State. External Research Division5
- United States. Federal Aviation Administration. Library Services Division4
- United States. National Archives and Records Service4
- United States. National Marine Fisheries Service4
- American Geophysical Union3