Title: Geologic map of the Goreville quadrangle, Johnson and Williamson Counties, Illinois /
Authors: Jacobson, R. J.; Damberger, Heinz H.; Trask, C. Brian.; Illinois State Geological Survey.; Northern Illinois University.
Publisher: Illinois Department of Energy and Natural Resources, Illinois State Geological Survey,
Year: 1991
Subjects: Geology Illinois Johnson County Maps.; Geology Illinois Williamson County Maps.; Johnson County (Ill.) Maps.; Williamson County (Ill.) Maps.