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Washability studies of the Mary Lee Seam at Lewisburg, Alabama

Washability studies of the Mary Lee bed at Hull Mine, Dora, Ala.

Washability studies of the Black Creek Bed at Bradford Mine, Dixiana, Ala.

Jigging, Classification, Tabling, and Flotation Tests of Coals Presenting Difficult Washing Problems, with Particular Reference to Coals from Pierce County, Washington


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