File:Longwall history fig 6.jpg
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Caption | Figure 6. Example of retreat longwall panels in Illinois (Toenges 1936). |
Publication | Bauer, Robert A., 2015 (version), History of Longwall Coal Mining in Illinois, Illinois State Geological Survey, Unpublished Manuscript Files, pp. 15. |
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current | 15:18, January 25, 2021 | 1,565 × 2,000 (654 KB) | Alan.Myers (talk | contribs) |
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