TY  - RPRT
TI  - Geologic map of the Calhoun quadrangle, western Kentucky
AU  - William D. Johnson
AU  - Avery E. Smith
PY  - 1975
DO  - 10.3133/gq1239
UR  - https://pubs.usgs.gov/publication/gq1239
ID  - gq1239
ER  -