Wages and hours of labor in the Portland cement industry, 1929 ... January, 1931. - United States. Bureau of Labor Statistics (Washington, U.S. Govt. Print. Off., 1931)
At head of title: United States Department of Labor. W.N. Doak, secretary. Bureau of Labor Statistics. Ethelbert Stewart, commissioner.
Issued also as House doc. 579, 71st Cong., 3 sess.
Keywords: Wages -- United States; Hours of labor; Portland cement