United States. Bureau of Mines. (1939). Carbonizing properties and petrographic composition of Sewell bed coal from Wyoming mine, Wyoming County, W. Va., and effect of blending this coal with Alma bed coal. [s.n.].
Chicago Style (17th ed.) CitationUnited States. Bureau of Mines. Carbonizing Properties and Petrographic Composition of Sewell Bed Coal from Wyoming Mine, Wyoming County, W. Va., and Effect of Blending This Coal with Alma Bed Coal. [Washington]: [s.n.], 1939.
MLA (9th ed.) CitationUnited States. Bureau of Mines. Carbonizing Properties and Petrographic Composition of Sewell Bed Coal from Wyoming Mine, Wyoming County, W. Va., and Effect of Blending This Coal with Alma Bed Coal. [s.n.], 1939.
Warning: These citations may not always be 100% accurate.