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Coal Resource Classification System of the U.S. Bureau of Mines and U.S. Geological Survey

http://pubs.usgs.gov/bul/b1450b/b1450.htm

A report published jointly by the U.S. Bureau of Mines and U.S. Geological Survey giving definitions of coal resource classification terms.

U.S. Geological Survey Bulletin 1450-B
Related topics:
Coal resources, Economic geology, Natural resource assessment, Terminologies and classifications

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