TY  - RPRT
TI  - Stratigraphy and petrology of the Permian rocks of southwestern Montana
AU  - Earle R. Cressman
AU  - Roger W. Swanson
PY  - 1964
DO  - 10.3133/pp313c
UR  - https://pubs.usgs.gov/publication/pp313C
ID  - pp313C
ER  -