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Figure 1 Map of the Illinois Basin, showing the extent of Pennsylvanian rocks, thickness of the Springfield Coal, and channels interrupting the coal. From Finley et al. (2005).

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current20:59, 17 July 2020Thumbnail for version as of 20:59, 17 July 20201,704 × 2,400 (727 KB)Alan.Myers (talk | contribs)