TY  - RPRT
TI  - Database of the United States Coal Pellet Collection of the U.S. Geological Survey Organic Petrology Laboratory
AU  - Nikolaus J. Deems
AU  - Paul C. Hackley
PY  - 2012
DO  - 10.3133/ofr20121151
UR  - https://pubs.usgs.gov/publication/ofr20121151
ID  - ofr20121151
ER  -