By: callanbentley
Image: USGS
License: Public Domain

Uploaded: 29 Apr 2020
Last Updated: 29 Apr 2020

101 megapixels
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Schmidt, R.G., and Strong, C.P., 1972, Geologic map of the Roberts Mountain quadrangle, Lewis and Clark County, Montana: U.S. Geological Survey, Geologic Quadrangle Map GQ-977, scale 1:24,000