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Administration of the Federal Coal-Mine Safety Act
Administration of the Federal Coal-Mine Safety Act, calendar year 1955
Administration of the Federal Coal-Mine Safety Act :calendar year 1954
Administration of the Federal Coal-Mine Safety Act, calendar year 1956
Administration of the Federal Coal-Mine Safety Act, calendar year 1957
Administration of the Federal Coal-Mine Safety Act, 1952-58
Administration of the Federal Coal-Mine Safety Act, 1952-60