TY  - RPRT
TI  - Generalized correlation chart for the Pennsylvanian of eastern Kentucky showing the principle coal beds, and named sandstones, marine markers, and clay beds
AU  - Charles L. Rice
PY  - 1977
DO  - 10.3133/ofr77876
UR  - https://pubs.usgs.gov/publication/ofr77876
ID  - ofr77876
ER  -