TY  - RPRT
TI  - Proterozoic crustal boundary in the southern part of the Illinois Basin
AU  - Paul C. Heigold
AU  - Dennis R. Kolata
PY  - 1993
DO  - 10.1016/0040-1951(93)90012-9
UR  - https://pubs.usgs.gov/publication/70018264
ID  - 70018264
ER  -