Coal resources of the Twomile Creek and portions of adjacent Frog Coulee 7 1/2-minute quadrangles, Richland County, Montana [cartographic material] / by Mary Alice Spencer ; prepared in cooperation with the Bureau of Land Management.
Relief shown by contours and spot heights. Title from envelope cover. Index map of study area on envelope cover. "Geology mapped in 1976 for U. S. Geological Survey"--Map sheet. Includes location map, quadrangle location, text, and table.
- Montana Bureau of Mines and Geology
- Held by
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