TY  - RPRT
TI  - The coal fields of Ohio, with a computation of the original coal content of the fields
AU  - J. A. Bownocker
AU  - F. R. Clark
PY  - 1917
DO  - 10.3133/pp100b
UR  - https://pubs.usgs.gov/publication/pp100B
ID  - pp100B
ER  -