- Creator:
- Geological Survey (U.S.)
- Contributor:
- Brown, John S
- Created:
- 1920
- Contributed By:
- University of Minnesota Libraries, John R. Borchert Map Library.
- Last Updated:
- 2021-10-05
- Creator:
- Geological Survey (U.S.)
- Contributor:
- Brown, John S
- Created:
- 1920
- Contributed By:
- University of Minnesota Libraries, John R. Borchert Map Library.
- Last Updated:
- 2021-10-05