File:Penn carbondale 4-1.jpg
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Figure 4-1. Chart showing the development of the Pennsylvanian classification in the Illinois Basin. From the Tri-State Committee (2001). Used courtesy of the Tri-State Committee.
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current | ★ Approved revision 20:39, 22 December 2020 | 3,001 × 2,371 (1.23 MB) | Jennifer.Obrad (talk | contribs) |
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