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- Completely digitized✖[remove]8
- Maps✖[remove]8
- Geological Survey (U.S.)✖[remove]8
- Bauman, Wm. (William)1
- Hill, Robert Thomas, 1858-19411
- Johnson, Willard D1
- United States. Dept. of the Interior1
- [Washington, D.C.] :✖[remove]8
Current results range from 1899 to 1930