File:Penn carbondale 4-74.jpg
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Figure 4-74. Graphic log of the Madison Coal Corp. No. 25 borehole from sec. 12, T 8 S, R 3 E, Williamson County, Illinois, the reference section for the Herrin Coal Member. © University of Illinois Board of Trustees.
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current | ★ Approved revision 21:22, 4 January 2021 | 1,227 × 3,034 (433 KB) | Jennifer.Obrad (talk | contribs) |
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