TY  - RPRT
TI  - Contour map of the base of the Pennsylvanian system, eastern Kentucky
AU  - T.D. Coskren
AU  - C. L. Rice
PY  - 1979
DO  - 10.3133/mf1100
UR  - https://pubs.usgs.gov/publication/mf1100
ID  - mf1100
ER  -