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Microscopic and petrographic studies of certain American coals,

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

Published Year

• 1930-1939 (2) *

Subject

• Coal--United States (2) *
• Microscopes (1)
• Microscopy (1)

Author

• Fieldner, Arno Carl, (1)
• Frederic, W. H. (1)
• Selvig, W. A. (1)
• Sprunk, George C., (1)
• Thiessen, Reinhardt, (1)

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