File:RetreatingLongwall.png
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 15:54, 20 August 2009 | | 768 × 821 (60 KB) | commons>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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