Report of Investigations - Illinois State Geological Survey

Reports of Investigations were published to release information in a timely fashion, awaiting the preparation of more detailed reports. They include summaries of the more important findings, and some contain considerable scientific findings. Although some refer to local or limited areas, all contain some data of general interest. The series is closed. No. 1 (1924) to No. 221 (1968)

Recent AdditionsRSS feed

Collection Statistics