Berg, R. C. (2001). Aquifer sensitivity classification for Illinois using depth to uppermost aquifer material and aquifer thickness. Illinois State Geological Survey.
Chicago-Zitierstil (17. Ausg.)Berg, Richard C. Aquifer Sensitivity Classification for Illinois Using Depth to Uppermost Aquifer Material and Aquifer Thickness. Champaign, Ill: Illinois State Geological Survey, 2001.
MLA-Zitierstil (9. Ausg.)Berg, Richard C. Aquifer Sensitivity Classification for Illinois Using Depth to Uppermost Aquifer Material and Aquifer Thickness. Illinois State Geological Survey, 2001.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.