File:Longwall history fig 1.jpg

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Caption Figure 1. Number of pre-fully mechanized longwall mines 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Bauer, Robert A., 2015 (version), History of Longwall Coal Mining in Illinois, Illinois State Geological Survey, Unpublished Manuscript Files, pp. 15.

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current10:19, January 27, 2021Thumbnail for version as of 10:19, January 27, 20211,608 × 2,675 (1.03 MB)Alan.Myers (talk | contribs)
15:05, January 25, 2021Thumbnail for version as of 15:05, January 25, 20211,565 × 2,000 (869 KB)Alan.Myers (talk | contribs)

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