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File:Coal Rank USGS.png
From WikiMD's Food, Medicine & Wellness Encyclopedia
Size of this preview: 480 × 600 pixels. Other resolution: 2,132 × 2,665 pixels.
Original file (2,132 × 2,665 pixels, file size: 140 KB, MIME type: image/png)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 02:09, 29 November 2014 | 2,132 × 2,665 (140 KB) | Plazak | {{Information |Description ={{en|1=Diagram of coal ranking system used in the United States (US Geological Survey)}} |Source ="An introduction to coal quality", US Geological Survey, Professional Paper 1625-F |Author =Stanley P. Schw... |
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