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Preparation characteristics of coal from Marion County, W. Va.
Preparation characteristics of coal from Butler County, Pa.
Preparation characteristics of coal from Monongalia County, W. Va.
Preparation characteristics of coal from Boone County, W. Va.
Preparation characteristics of coal from Harrison County, W. Va.
Preparation characteristics of coal from Nicholas County, W. Va.
Washability characteristics of the lower Hartshorne (Spadra) coalbed near Clarksville, Ark.
Preparation characteristics of coal from Kanawha County, W. Va.