File:Penn carbondale 4-31.jpg

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Figure 4-31. Graphic log of the Audubon Oil & Gas No. 1 Fritschle borehole in sec. 20, T 6 N, R 9 E, Jasper County, Illinois, the reference section for the Wheeler and Bevier Coals in Illinois. © University of Illinois Board of Trustees.

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17:11, 23 December 2020		Thumbnail for version as of 17:11, 23 December 20202,233 × 3,000 (858 KB)Jennifer.Obrad (talk | contribs)

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