TY  - RPRT
TI  - Collected papers from the sixth annual meeting of the society for organic petrology
AU  - R.D. Harvey
AU  - J.C. Crelling
AU  - D.D. Kaegi
PY  - 1991
UR  - https://pubs.usgs.gov/publication/70015048
ID  - 70015048
ER  -