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 ยท Dewey A. Reynolds ยท George C. Sprunk ยท Clarence Raymond Holmes
1941 เดเดจเต ยท U.S. Department of the Interior, Bureau of Mines