Outline of the geological history of Illinois
Early Paleozoic by Thomas E. Savage, Mississippian system by Stuart Weller, and Pennsylvanian System by Frank W. DeWolf
Resume of geologic history of the state
De Wolf, F. W.
Manuscripts, maps, fieldnotes, and photographs may be viewed in-house only. Please contact the ISGS Special Collections Curator, Anne Huber, for an appointment at 217-300-0005 or email firstname.lastname@example.org Monday thru Friday, 8am-noon or 1pm-5pm.