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- United States50,890
- United States. National Aeronautics and Space Administration24,410
- Yale University, degree granting institution19,856
- Geological Survey (U.S.)14,584
- United States. Bureau of the Census13,056
- United States. General Accounting Office11,969
- Shakespeare, William, 1564-161610,887
- Walter L. Pforzheimer Intelligence Collection (Beinecke Rare Book and Manuscript Library)9,512
- Christie, Manson & Woods8,157
- Langley Research Center7,763
- U.S. Atomic Energy Commission6,772
- United States. Department of State6,703
- United States. War Department6,679
- United States. Department of the Army6,096
- United States. Congress. House. Committee on Naval Affairs6,036
- Goethe, Johann Wolfgang von, 1749-18325,785
- Riewert Tode Collection of German Student Movements and Counter-Culture5,784
- United States. Congress. Senate. Committee on Foreign Relations5,657
- Great Britain5,309
- United States. Forest Service5,197