TY  - RPRT
TI  - Geologic map of the Olney quadrangle, Caldwell and Hopkins Counties, Kentucky
AU  - Robert Denny Trace
AU  - Thomas M. Kehn
PY  - 1968
DO  - 10.3133/gq742
UR  - https://pubs.usgs.gov/publication/gq742
ID  - gq742
ER  -