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- United States47,152
- Geological Survey (U.S.)36,961
- United States. National Aeronautics and Space Administration24,926
- Yale University, degree granting institution19,750
- United States. Bureau of the Census12,351
- Walter L. Pforzheimer Intelligence Collection (Beinecke Rare Book and Manuscript Library)8,691
- Langley Research Center7,769
- Christie, Manson & Woods7,329
- U.S. Atomic Energy Commission6,814
- United States. Department of State6,569
- United States. War Department6,050
- United States. Congress. House. Committee on Naval Affairs5,979
- Shakespeare, William, 1564-16165,497
- United States. Department of the Army5,241
- United States. Forest Service5,239
- Sotheby & Co. (London, England)4,776
- United States. General Accounting Office4,738
- Great Britain4,465
- Lewis Research Center4,074
- Samuel R. Delany Library (Beinecke Rare Book and Manuscript Library). Reading Library3,750