File:Penn carbondale 4-43.jpg
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Figure 4-43. Section from the ravine northeast of Summum, showing the Houchin Creek Coal and enclosing strata. Data from Wanless (1957, p. 204-205). © University of Illinois Board of Trustees.
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current | ★ Approved revision 19:16, 23 December 2020 | 1,155 × 3,138 (484 KB) | Jennifer.Obrad (talk | contribs) |
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