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 From ISGS unpublished map by W.J. Nelson (2014), modified from Hatch and Affolter (2002).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||21:02, 23 December 2020||2,483 × 3,300 (2.85 MB)||IlLex|