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Subjects
History, America, discovery and exploration, Canyons, Colorado river and valley, Discovery and exploration, Geography, Geological survey (u.s.), Geological surveys, Local government, Paleontology, Paleontology, united states, Scientific expeditions, Sources, Travel, United States, United States. Army. Corps of Topographical Engineers, United states, army, corps of engineersTime
19th centuryID Numbers
- OLID: OL1082894A
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August 20, 2008 | Edited by an anonymous user | fix author name |
April 1, 2008 | Created by an anonymous user | initial import |