File:Coal Rank USGS.png
From Infogalactic: the planetary knowledge core
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Summary
Diagram of coal ranking system used in the United States (US Geological Survey)
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 09:39, 5 January 2017 | | 2,132 × 2,665 (140 KB) | 127.0.0.1 (talk) | Diagram of coal ranking system used in the United States (US Geological Survey) |
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