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Carbonizing properties of Boone County, W. Va., coals
Carbonizing properties of Butler County, Pa., coals
Carbonizing properties of Perry County, Ky., coals
Carbonizing properties of coals from Elk, Clarion, Jefferson, Clearfield, and Centre Counties, Pa.
Carbonizing properties of coals from Buchanan, Dickenson, Russell, Tazewell, and Wise Counties, Va.