Technological changes and employment in the electric-lamp industry - Bowden, Witt, 1886-; United States. Bureau of Labor Statistics (Washington, U.S. Govt. print. off., 1933)
At head of title: United States Department of labor. Frances Perkins, secretary. Bureau of labor statistics. Isador Lubin, commissioner.
Issued also as House doc. 156, 73d Cong., 2d sess.
Keywords: Electric lamps; Labor productivity; Unemployed -- United States; Electric lighting