TY  - RPRT
TI  - Geologic map of the Portage Quadrangle, Cascade and Choteau counties, Montana
AU  - E. K. Maughan
AU  - R. W. Lemke
PY  - 1991
DO  - 10.3133/i2196
UR  - https://pubs.usgs.gov/publication/i2196
ID  - i2196
ER  -