United States. Bureau of Mines. (1940). Friability, grindability, chemical analyses and high-and low-temperature carbonization assays of Alabama coals. [s.n.].
Chicago Style (17th ed.) CitationUnited States. Bureau of Mines. Friability, Grindability, Chemical Analyses and High-and Low-temperature Carbonization Assays of Alabama Coals. [Washington]: [s.n.], 1940.
MLA (9th ed.) CitationUnited States. Bureau of Mines. Friability, Grindability, Chemical Analyses and High-and Low-temperature Carbonization Assays of Alabama Coals. [s.n.], 1940.
Warning: These citations may not always be 100% accurate.