File:Penn carbondale 4-68.jpg
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Figure 4-68. Diagram modified from Willman and Payne (1942) illustrating the relationship of Spring Lake Coal to adjacent units. Copyright © 1942 University of Illinois Board of Trustees.
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current | ★ Approved revision 21:38, 27 January 2021 | 1,811 × 2,067 (766 KB) | Jennifer.Obrad (talk | contribs) |
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