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- Preparation characteristics of coal from Wise County, Va.
- Preparation characteristics of coal from Dickenson County, Va.
- Preparation characteristics of coal from Greene County, Pa.
- Preparation characteristics of coal from Allegheny County, Pa.
- Preparation characteristics of coal from Washington County, Pa.
- 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.