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  • File:Penn caseyville 2-1.jpg
    ...map. Base map courtesy of the U.S. Geological Survey. Map drafted by Alan Myers. © University of Illinois Board of Trustees.
    (2,551 × 3,300 (10.33 MB)) - 16:12, 20 July 2020
  • File:Penn caseyville 2-5.jpg
    ...e the formation has been identified in the subsurface. Map drafted by Alan Myers. © University of Illinois Board of Trustees.
    (2,551 × 3,301 (875 KB)) - 16:17, 20 July 2020