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Classification chart of typical coals of the United States :showing B.t.u. per pound on the moist, mineral-matter-free basis, plotted against fixed carbon on the dry, mineral-matter-free basis

Coal-research activities of the Bureau of Mines

Annual report of research and technologic work on coal :fiscal year 1950

Published Year

• 1930-1939 (1)
• 1940-1949 (1)
• 1950-1959 (1)

Subject

• Coal--United States (3) *
• Coal--Research (2)

Author

• Fieldner, Arno Carl, (3) *
• Frederic, W. H. (1)
• Gottley, Sidney. (1)
• Selvig, W. A. (1)

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