TY  - RPRT
TI  - Coal resources of the United States, A progress report, November 1, 1950
AU  - Paul Averitt
AU  - Louise R. Berryhill
PY  - 1950
DO  - 10.3133/cir94
UR  - https://pubs.usgs.gov/publication/cir94
ID  - cir94
ER  -