TY  - RPRT
TI  - Some middle Cenomanian (Upper Cretaceous) acanthoceratid ammonites from the Western Interior of the United States
AU  - W. A. Cobban
PY  - 1987
DO  - 10.3133/pp1445
UR  - https://pubs.usgs.gov/publication/pp1445
ID  - pp1445
ER  -