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1. Reduction in frictional ignition due to conical coal-cutting bits / by Lung Cheng, Aldo L. Furno, Welby G. Courtney

by Cheng, Lung | Furno, A. L | Courtney, Welby G.

Material type: book Book; Format: print Publisher: Pittsburgh, Pa. : U.S. Dept. of the Interior, Bureau of Mines, [1987]Availability: No items available

2. Deposition of respirable coal dust in an airway / by Welby G. Courtney, Lung Cheng, Edward F. Divers

by Courtney, Welby G | Cheng, Lung | Divers, Edward F.

Material type: book Book; Format: print Publisher: Washington : U. S. Dept. of the Interior, Bureau of Mines, 1986Availability: No items available