Carbonizing properties and petrographic 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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