TY  - RPRT
TI  - Gastropoda, Cephalopoda, and Trilobita of the Amsden Formation (Mississippian and Pennsylvanian) of Wyoming
AU  - Mackenzie Gordon
AU  - Ellis Leon Yochelson
PY  - 1975
DO  - 10.3133/pp848f
UR  - https://pubs.usgs.gov/publication/pp848F
ID  - pp848F
ER  -