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Bureau of mines research and technologic work on coal, 1960
Bureau of mines research and technologic work on coal, 1959
Production of mineral fuels and hydropower in the United States since 1800
Bureau of mines research and technologic work on coal, 1962
Bureau of mines research and technologic work on coal, 1961
Bureau of Mines research and technologic work on coal, 1963
Bureau of mines research and technologic work on coal, 1964