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  • File:C605-Figure-08.jpg
    ...Coal reserves of southeastern Illinois: Illinois State Geological Survey, Circular 431, 25 p., 2 pl.</ref>) superimposed. ...f Pennsylvanian sand bodies in Illinois: Illinois State Geological Survey, Circular 339, 36 p., 3 pls.<br>
    (2,350 × 1,736 (1.52 MB)) - 16:42, 21 August 2023
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