Carbonizing Properties and Petrographic Composition of Upper Freeport Coal from Morgantown District, Monongalia County, W. Va: And of Lower Freeport Coal from Eastern Indiana County, Near Cambria County, Pa
Arno Carl Fieldner ┬╖ Joseph Dana Davis ┬╖ Walter Alfred Selvig ┬╖ Dewey A. Reynolds ┬╖ Ralph Emmet Brewer ┬╖ George C. Sprunk ┬╖ Clarence Raymond Holmes
резрепрекрез рдЬрдирд╡рд░реА ┬╖ U.S. Department of the Interior, Bureau of Mines