TY  - RPRT
TI  - Plant and miscellaneous microfossils of the Pierre Shale
AU  - Estella B. Leopold
AU  - Bernadine D. Tschudy
PY  - 1965
DO  - 10.3133/ofr6597
UR  - https://pubs.usgs.gov/publication/ofr6597
ID  - ofr6597
ER  -