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- Maps, Atlases & Globesโ[remove]3
- Geological Survey (U.S.)โ[remove]3
- Barnard, E. C. (Edward Chester), 1863-1921โ[remove]3
- Geological Survey (U.S.). Annual report2
- Johnson, A. J2
- Gannett, Henry, 1846-19141
- Hefty, J. G1
- Reaburn, D. L1
Current results range from 1900 to 1907