Geologic map of the Roberts Mountain quadrangle, Lewis and Clark County, Montana
By: Department of the Interior, United States Geological Survey ; by Robert George Schmidt and Ceylon P. Strong, Jr.
Contributors: Schmidt, Robert George.; Strong, Ceylon P.
Series: Geologic quadrangle map -- GQ-977.
Publisher: The Survey
Place of publication: Reston, Va
Format: Map
Subjects: Geology -- Montana -- Lewis and Clark County -- Maps.
Genres: Maps.
Other titles: Roberts Mountain quadrangle, Lewis and Clark County, Montana, geologic map.
Notes: Relief shown by contours and spot heights.

"Geology mapped in 1965-66."

Includes col. cross section, bibliography, index showing quadrangle location, and quadrangle map.