File:Longwall history fig 2.jpg
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Caption | Figure 2. Number of pre-fully mechanized longwall mines & years of operation per county. |
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| Bauer, Robert A., 2015 (version), History of Longwall Coal Mining in Illinois, Illinois State Geological Survey, Unpublished Manuscript Files, pp. 15.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 | 15:13, January 25, 2021 | 1,565 × 2,000 (879 KB) | Alan.Myers (talk | contribs) |
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