Geologic map of the Big Sheep Mountain quadrangle, Prairie County, Montana /

[Reston, Va.] : [Denver, Colo.] : The Survey ; [Books and Open-File Reports Section, distributor], 1994

Geologic map of the North Coulee quadrangle, Prairie County, Montana /

by Colton, Roger B. (Roger Burnham), 1924-
[Reston, Va.] : The Survey, 1994

Geologic map of the Lindsay SW quadrangle, Dawson County, Montana /

by Colton, Roger B. (Roger Burnham), 1924-
[Reston, Va.] : The Survey, 1994