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
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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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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| 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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