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- Maps4
- Douglas, Edward Morehouse, 1855-1932✖[remove]4
- Gannett, Henry, 1846-19142
- Marshall, R. B. (Robert Bradford), 1867-19492
- Matthes, François, 1874-19482
- Chapman, R. H. (Robert Hollister), 1868-19201
- Hague, A. (Arnold), 1840-19171
- Iddings, Joseph Paxson, 1857-19201
- Leffingwell, W. H1
- Northern Transcontinental Survey1
- Rensh1
Current results range from 1893 to 1918