TY  - RPRT
TI  - Geologic map of the Ogle Quadrangle, Clay and Knox Counties, Kentucky
AU  - Russell G. Ping
AU  - R.E. Sergeant
PY  - 1977
DO  - 10.3133/ofr77635
UR  - https://pubs.usgs.gov/publication/ofr77635
ID  - ofr77635
ER  -