Coal resource classification system of the U.S. Bureau of Mines and U.S. Geological Survey.

A report published jointly by the U.S. Bureau of Mines and U.S. Geological Survey.

Bibliographic Details

Corporate Authors:	United States. Bureau of Mines, Geological Survey (U.S.)
Format:	Government Document Book
Language:	English
Series:	Geological Survey bulletin ; 1450-B.
Subjects:	Coal > Classification.