Code of lighting, factories, mills and other work places, revision of 1930 : American standard
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Code of lighting, factories, mills and other work places, revision of 1930 : American standard
(Bulletin / Bureau of Labor Statistics, no. 556)(Safety code series)
U.S. G.P.O , For sale by the Supt. of Docs., U.S. G.P.O., 1931
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At head of title: United States Department of Labor, Bureau of Labor Statistics
Includes index