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File:Coal Rank USGS.png

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Summary

Description
English: Diagram of coal ranking system used in the United States (US Geological Survey)
Date
Source "An introduction to coal quality", US Geological Survey, Professional Paper 1625-F
Author Stanley P. Schweinfurth
Permission
(Reusing this file)		 Public domain, product of US federal government

Licensing

Public domain
This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.

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Date/TimeThumbnailDimensionsUserComment
current02:09, 29 November 2014Thumbnail for version as of 02:09, 29 November 20142,132 × 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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