Author
Illinois Department of Energy and Natural Resources
Illinois State Geological Survey
9
Lumm, Donald K
4
Nelson, W. John
4
Northern Illinois University Laboratory for Cartography and Spatial Analysis
3
Cooperative Geological Mapping Program (U.S.)
2
Geological Survey (U.S.)
2
Illinois Hazardous Waste Research and Information Center
2
Illinois Department of Natural Resources
1
Illinois Dept. of Energy and Natural Resources
1
Illinois Dept. of Natural Resources
1
Jacobson, R. J
1
Trask, C. Brian
1