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Report of investigations
Illinois State Geological Survey - Urbana, Ill. : Survey - Nr. 1.1924 - 221.1968; damit Ersch. eingest.
Persistent link: https://www.econbiz.de/10011329374
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Bulletin / State of Illinois, Department of Registration and Education, Division of the State Geological Survey
Illinois State Geological Survey - Urbana, Ill. - Nr. 1.1906 -
Persistent link: https://www.econbiz.de/10010446000
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Circular / Illinois State Geological Survey. Department of Registration and Education, State of Illinois
Illinois State Geological Survey - 1938-: Urbana, Ill. : Survey - 33.1938 -
Persistent link: https://www.econbiz.de/10010449163