TY  - RPRT
TI  - Callovian (Jurassic) ammonites from the United States and Alaska; Part 1, Western interior United States
AU  - R. W. Imlay
PY  - 1953
DO  - 10.3133/pp249a
UR  - https://pubs.usgs.gov/publication/pp249A
ID  - pp249A
ER  -