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Coal resources of the United States, A progress report, November 1, 1950
Paul Averitt, Louise R. Berryhill
1950, Circular 94
Interest in the quantity and quality of the coal reserves of the United States has increased greatly since the end of World War II, principally because of the growing realization that the ultimate reserves of petroleum and natural gas, although largely undefined, still. have finite limits. With the greatly increased...