1. Geologic map of the Opheim 30ʹ x 60ʹ quadrangle, Valley and Daniels counties, Montana [microform]
1989. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey : [Books and Open-File Reports Section, distributor]. English. Public. Montana, Valley County, and Daniels County.
