TY  - RPRT
TI  - Floral-faunal associations in American coal balls
AU  - S.H. Mamay
AU  - E. L. Yochelson
PY  - 1953
DO  - 10.1126/science.118.3061.240
UR  - https://pubs.usgs.gov/publication/70011090
ID  - 70011090
ER  -