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- Project Muse276
- ebrary, Inc180
- United States. Department of State42
- Walter L. Pforzheimer Intelligence Collection (Beinecke Rare Book and Manuscript Library)33
- United States. Army. Corps of Topographical Engineers29
- ProQuest (Firm)28
- United States. Army. Corps of Engineers22
- United States. War Department22
- Castro, Fidel, 1926-201620
- Langley, Lester D.19
- United States19
- Frémont, John Charles, 1813-189017
- Project Muse. distributor17
- Selser, Gregorio17
- Making of America Project16
- Emory, William H. (William Hemsley), 1811-188715
- Pan American Union15
- Project Muse, distributor15
- United States. Department of State, author15
- McPherson, Alan L.13