TY  - RPRT
TI  - Ammonites and some characteristic bivalves from the Upper Cretaceous Frontier Formation, Natrona County, Wyoming
AU  - William A. Cobban
PY  - 1990
DO  - 10.3133/b1917b
UR  - https://pubs.usgs.gov/publication/b1917B
ID  - b1917B
ER  -