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- Adam Matthew Digital (Firm), publisher923
- Adam Matthew Digital (Firm), digitiser763
- United States713
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- United States. National Aeronautics and Space Administration269
- ebrary, Inc251
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- Columbus, Christopher168
- Infobase, film distributor157
- Project Muse138
- Cook, James, 1728-1779137
- Robertson, William, 1721-1793122
- Irving, Washington, 1783-1859113
- Jet Propulsion Laboratory (U.S.)110
- Switch International108
- United States. Army. Corps of Engineers108
- United States. Department of State103
- Smithsonian Institution. Board of Regents90