TY  - RPRT
TI  - Preliminary geologic map and coal sections of the Twin Buttes Quadrangle, Prairie and Custer counties, Montana
AU  - E. J. McKay
AU  - F.W. Mason
PY  - 1975
DO  - 10.3133/mf725
UR  - https://pubs.usgs.gov/publication/mf725
ID  - mf725
ER  -