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- United States32,914
- United States. National Aeronautics and Space Administration7,715
- U.S. Atomic Energy Commission6,223
- Geological Survey (U.S.)6,120
- United States. Bureau of the Census5,194
- United States. General Accounting Office4,194
- United States. Department of the Army3,746
- Langley Research Center3,678
- Lewis Research Center2,881
- United States. Department of State2,757
- United States. Bureau of Labor Statistics2,609
- United States. Forest Service2,539
- United States. Soil Conservation Service2,535
- United States. National Park Service2,256
- United States. Congress. Senate. Committee on Foreign Relations1,806
- U.S. Fish and Wildlife Service1,738
- United States. Congress. Senate. Committee on Finance1,581
- United States. War Department1,440
- United Kingdom Atomic Energy Authority. Research Group1,400
- United States. Congress. Senate. Committee on the Judiciary1,236