TY  - RPRT
TI  - A stable carbon isotope and biological marker study of Polish bituminous coals and carbonaceous shales
AU  - M.J. Kotarba
AU  - J.L. Clayton
PY  - 2003
DO  - 10.1016/s0166-5162(03)00082-x
UR  - https://pubs.usgs.gov/publication/70025809
ID  - 70025809
ER  -