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- Maps2
- Geographical Surveys West of the 100th Meridian (U.S.)✖[remove]2
- United States. Army. Corps of Engineers. Topographical atlas projected to illustrate explorations and surveys west of the 100th meridian of longitude✖[remove]2
- Wheeler, George M. (George Montague), 1842-19052
Current results range from 1878 to 1879