TY  - RPRT
TI  - U.S. Geological Survey ground-water studies in Illinois
AU  - D. C. Voelker
AU  - J.R. Nicholas
AU  - K.L. Norton
PY  - 1988
DO  - 10.3133/ofr88143
UR  - https://pubs.usgs.gov/publication/ofr88143
ID  - ofr88143
ER  -