University of Illinois Urbana-Champaign

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Thumbnail for 43rd annual Tri-state Geological Field Conference, October 5-7, 1979 : Geology of Western Illinois
43rd annual Tri-state Geological Field Conference, October 5-7, 1979 : Geology of Western Illinois
Tri-State Geological Field Conference (43rd : 1979 : Grafton, Ill.)