U.S. Dept. of Labor, Bureau of Labor Statistics , For sale by the Supt. of Docs., U.S. Govt. Print. Off.
1968-
Bulletin / Bureau of Labor Statistics
no. 1358, 1386, 1602, 1839, 2221, 2346
Mar. 1962 , Nov. 1962 , Sept. 1967 , Aug. 1972 , Aug. 1983 , Oct. 1988
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