File:Penn carbondale 4-57.jpg

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Figure 4-57. Map showing the thickness of the Springfield Coal in Illinois, Indiana, and western Kentucky. From ISGS unpublished map by W.J. Nelson (2014), modified from Hatch and Affolter (2002). Original figure used courtesy of the U.S. Geological Survey.

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current ★ Approved revision
21:02, 23 December 2020
Thumbnail for version as of 21:02, 23 December 20202,483 × 3,300 (2.85 MB)Jennifer.Obrad (talk | contribs)

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