COAL RESOURCE CLASSIFICATION SYSTEM OF THE U.S. BUREAU OF MINES AND U.S. GEOLOGICAL SURVEY
Mineral Resource Classification Systems of the U.S. Bureau of Mines and the U.S. Geological Survey
GEOLOGICAL SURVEY BULLETIN 1450-B
A report published jointly by the U.S. Bureau of Mines and U.S. Geological Survey. Definitions of coal resource classification terms used by the U.S. Bureau of Mines and U.S. Geological Survey.
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