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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current20:39, 22 December 2020Thumbnail for version as of 20:39, 22 December 20203,001 × 2,371 (1.23 MB)IlLex (talk | contribs)

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