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By: Collinson, Charles William - Geological Society of America. Meeting DeKalb, Ill.) - Geological Society of America. North-Central Section. Meeting DeKalb, Ill.) - Pander Society.Edition:Publication info: Urbana, Illinois State Geological Survey, 1972Volume: Illinois State Geological Survey guidebook series,Series:Holding Institution: University Library, University of Illinois Urbana ChampaignSubjects:BHL Collections: