TY  - RPRT
TI  - Coal beds of the Troublesome quadrangle, Breathitt, Knott, and Perry Counties, Kentucky
AU  - Allen D. Williamson
AU  - W.L. Adkison
PY  - 1953
DO  - 10.3133/coal18
UR  - https://pubs.usgs.gov/publication/coal18
ID  - coal18
ER  -