File:Coal Rank USGS.png

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current03:09, 29 November 2014No thumbnail2,132 × 2,665 (140 KB)commonswiki>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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