1981. 2002-06-01T04:00:00Z. 2023-02-22T04:01:20Z. Geological Survey (U.S.). The Survey. English. text. Public. Montana, Big Horn County, and Big Horn County (Mont.).
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2. Geologic map of parts of the Plains and Perma quadrangles, western Montana [cartographic material]
1981. 2002-06-01T04:00:00Z. 2023-02-18T04:01:20Z. Geological Survey (U.S.). The Survey. English. text. Public. Montana.