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- United States32,551
- United States. National Aeronautics and Space Administration7,707
- U.S. Atomic Energy Commission6,217
- Geological Survey (U.S.)6,057
- United States. General Accounting Office4,144
- United States. Department of the Army3,746
- Langley Research Center3,646
- Lewis Research Center2,876
- United States. Department of State2,678
- United States. Soil Conservation Service2,533
- United States. Forest Service2,456
- United States. National Park Service2,248
- United States. Bureau of the Census1,941
- United States. Congress. Senate. Committee on Foreign Relations1,793
- U.S. Fish and Wildlife Service1,722
- United States. Congress. Senate. Committee on Finance1,565
- United States. War Department1,437
- United Kingdom Atomic Energy Authority. Research Group1,400
- United States. Congress. Senate. Committee on the Judiciary1,232
- United States. Bureau of Land Management1,157