Bulletin. 506. Carbonizing properties, West Virginia coals from Pittsburgh bed, Jamison no. 9 mine, Marion County, and upper Freeport bed, Bull Run no. 1 mine, Preston County [with list of Publications on survey of carbonizing properties of American coals]; by J. D. Davis, D. A. Reynolds, R. E. Brewer, D. E. Wolfson, B. W. Naugle, and G. W. Birge.

Tools