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    Hydrogeology of the basal confining unit of the carbonate aquifer system in the midwestern basins and arches region of Indiana, Ohio, Michigan, and Illinois by Casey, George D.

    Published: The Survey : For sale by Books and Open-File Reports Section [distributor], 1992
    Description: 2 maps on 2 sheets ; each 67 x 80 cm, sheets 101 x 153 cm.
    “…U.S. Geological Survey open-file report ;…”
    Map