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Preparation characteristics of coal from Somerset County, Pa.
Preparation characteristics of coal from Fayette County, Pa.
Preparation characteristics of coal occurring in Westmoreland County, Pa.
Preparation characteristics of coal from Pike County, Ky.
Preparation characteristics of coal from Floyd County, Ky.
Preparation characteristics of coal from Knott County, Ky.
Preparation characteristics of coal from Jefferson County, Pa.
Preparation characteristics of coal from Raleigh County, W. Va.
Preparation characteristics of coal from McDowell County, W. Va.
Preparation characteristics of coal from Harlan County, Ky.
Preparation characteristics of coal from Wyoming County, W. Va.
Preparation characteristics of coal from Lechter County, Ky.
Preparation characteristics of coal from Mingo County, W. Va.
Preparation characteristics of coal from Perry County, Ky.
Preparation characteristics of coal from Lee County, Va.
Preparation characteristics of coal from Bell County, Ky.
Preparation characteristics of coal from Logan County, W. Va.