TY  - RPRT
TI  - Petrology, mineralogy and geochemistry of mined coals, western Venezuela
AU  - Paul C. Hackley
AU  - Peter D. Warwick
AU  - Eligio Gonzalez
PY  - 2005
DO  - 10.1016/j.coal.2005.02.006
UR  - https://pubs.usgs.gov/publication/70195415
ID  - 70195415
ER  -