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Preparation characteristics of coal from Nicholas County, W. Va.

Removing methane (degasification) from the Pittsburgh coalbed in northern West Virginia

Preparation characteristics of coal from Kanawha County, W. Va.

Preparation characteristics of coal from Hancock, Brooke, Ohio, and Marshall counties, W. Va.

Preparation characteristics of coal from Fayette County, W. Va.

Preparation characteristics of coal from Clay, Gilmer, and Lewis counties, W. Va.


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