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- Irving, Washington, 1783-1859136
- Carver, Jonathan, 1710-178040
- Northern Pacific Railroad Company28
- AM (Publisher), digitiser22
- Lettsom, John Coakley, 1744-181518
- Newberry Library, owner17
- Smet, Pierre-Jean de, 1801-187317
- Great Northern Railway Company (U.S.)16
- Bonneville, Benjamin Louis Eulalie de, 1796-187815
- Pacific Northwest Research Station (Portland, Or.)14
- Meeker, Ezra, 1830-192813
- United States. War Department13
- Geological Survey (U.S.)12
- Chicago, Milwaukee, and St. Paul Railway Company11
- Wheeler, Olin D. (Olin Dunbar), 1852-192511
- Kelley, William D. (William Darrah), 1814-189010
- Langford, Nathaniel Pitt, 1832-191110
- Coues, Elliott, 1842-18999
- Geological Survey (U.S.), issuing body9
- Newson, T. M. (Thomas McLean), 1827-18939