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- United States32,817
- United States. National Aeronautics and Space Administration7,711
- U.S. Atomic Energy Commission6,217
- Geological Survey (U.S.)6,113
- United States. Bureau of the Census5,118
- United States. General Accounting Office4,182
- United States. Department of the Army3,743
- Langley Research Center3,678
- Lewis Research Center2,881
- United States. Department of State2,744
- United States. Bureau of Labor Statistics2,605
- United States. Forest Service2,534
- United States. Soil Conservation Service2,534
- United States. National Park Service2,240
- United States. Congress. Senate. Committee on Foreign Relations1,805
- U.S. Fish and Wildlife Service1,737
- United States. Congress. Senate. Committee on Finance1,578
- United States. War Department1,435
- United Kingdom Atomic Energy Authority. Research Group1,400
- United States. Congress. Senate. Committee on the Judiciary1,216