File:Penn carbondale 4-33.jpg
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Figure 4-33. Graphic logs of three cores from Iowa illustrating the Wheeler and Bevier Coals. From Ravn et al. (1984). Figure provided courtesy of the Iowa Geological Survey, the University of Iowa. These cores are reference sections for both units.
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current | ★ Approved revision 17:26, 23 December 2020 | 1,779 × 2,830 (1.68 MB) | Jennifer.Obrad (talk | contribs) |
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