TY  - RPRT
TI  - Bedrock geologic map of the St. Louis 30' x 60' Quadrangle, Missouri and Illinois
AU  - R. W. Harrison
PY  - 1997
DO  - 10.3133/i2533
UR  - https://pubs.usgs.gov/publication/i2533
ID  - i2533
ER  -