Public domain. Cover image from Project Gutenberg ebook #65704.
Guide to the Geologic Map of Illinois
Chapitres (5)
- Guide to the GEOLOGIC MAP OF ILLINOIS 0:00
- Guide to the GEOLOGIC MAP OF ILLINOIS: GLACIAL GEOLOGY 0:37
- ILLINOIS STATE GEOLOGICAL SURVEY 22:07
- EDUCATIONAL EXTENSION PROGRAM 23:57
- Transcriber’s Notes 27:16
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