Carbonizing Properties and Petrographic Composition of Powellton-bed Coal from Elk Creek No. 1 Mine, Emmett, Logan County, W. Va: And the Effect of Blending this Coal with Pocahontas No. 3- and No. 4-bed Coals
Joseph Dana Davis · Dewey A. Reynolds · George C. Sprunk · Clarence Raymond Holmes
ม.ค. 1941 · U.S. Department of the Interior, Bureau of Mines