1. Geologic map of the Black Butte Mountain quadrangle, Meagher County, Montana [cartographic material]
1977. 2012-06-04T18:56:42Z. 2012-06-13T15:04:00Z. McGrew, Laura W. (Laura Wenger), 1921-. U.S. Geological Survey. English. Public. Montana, Meagher County, and U.S.