Illinois State Geological Survey Manuscript County: St. Clair Title: Kaskaskia valley reports (A) Maps and mapping in the Kaskaskia valley, GE Ekblaw (B) Surficial and subsurface geology and structure of the Kaskaskia valley, GE Ekblaw (C) Mineral resources and future possibilities of the Kaskaskia valley, MM Leighton Author: Leighton, Morris M., G.E. Ekblaw Call Number: MS Leighton, M.M. #152 Location Record 13 of 16