TY  - RPRT
TI  - Slide set describing aspects of the origin of coal, coal mining, and peat formation
AU  - R.W. Stanton
AU  - B.S. Pierce
PY  - 1991
DO  - 10.3133/ofr91390
UR  - https://pubs.usgs.gov/publication/ofr91390
ID  - ofr91390
ER  -