Coal. Carbonizing properties and petrographie composition of Hazard no. 4 coal from Columbus no. 4 mine and high-temperature carbonizing properties of Hazard no. 7 coal from Hardburly mine, Perry County, Ky.; by J. D. Davis, D. A. Reynolds, W. H. Ode, C. R. Holmes, J. L. Elder, and J. E. Wilson.

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