TY  - RPRT
TI  - Geologic map of the Shady Grove quadrangle, Crittenden and Caldwell Counties, Kentucky
AU  - Robert Denny Trace
AU  - James Edward Palmer
PY  - 1971
DO  - 10.3133/gq880
UR  - https://pubs.usgs.gov/publication/gq880
ID  - gq880
ER  -