File:Penn carbondale 4-77.jpg
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Figure 4-77. The “blue band” at a site where the Herrin Coal is reduced to thin streaks of coal, box cut at the Francisco Mine, Gibson County, Indiana. Photograph 2010 by Scott D. Elrick. © University of Illinois Board of Trustees.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | ★ Approved revision 21:28, 4 January 2021 | | 2,401 × 2,041 (4.22 MB) | Jennifer.Obrad (talk | contribs) |
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