File:RetreatingLongwall.png
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editDescriptionRetreatingLongwall.png |
English: Origional caption: "Fig. 36. Block system of Retreating Long-wall, West Virginia." Plan of a multi-panel longwall retreat mine, circa 1917. Edge detection has been used to convert the figure to a line drawing. |
Date | |
Source | Percentage of Extraction on of Bituminous Coal with Special Reference to Illinois Conditions, Engineering Experiment Station Bulletin No. 100, University of Illinois, page 115. |
Author | C. M. Young |
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current | 15:54, 20 August 2009 | ![]() | 768 × 821 (60 KB) | Douglas W. Jones (talk | contribs) | {{Information |Description={{en|1=Origional caption: "Fig. 36. Block system of Retreating Long-wall, West Virginia." Plan of a multi-panel longwall retreat mine, circa 1917. Edge detection has been used to convert the figure to a line drawing.}} |Sour |
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