File:RetreatingLongwall.png

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	15:54, 20 August 2009		768 × 821 (60 KB)	Douglas W. Jones	{{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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