Browse Illinois State Geological Survey (ISGS) by Contributor "McGarry, Christopher S."

  • Kolata, Dennis R. (Illinois State Geological Survey, Department of Natural Resources, 2005)
    This map is a revision of the 1:500,000 Geologic Map of Illinois compiled by Willman et al. (1967)."/ Includes a source map and ancillary map: "Areas mapped since 1967."/ "3M - 8/05."/ On verso: Two cross sections, 2 ...


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