Productivity of labor in merchant blast furnaces ... December, 1928. - United States. Bureau of Labor Statistics (Washington, U.S. Govt. print. off., 1929)
At head of title: U.S. Department of labor. James J. Davis, secretary. Bureau of labor statistics. Ethelbert Stewart, commissioner.
Issued also as House doc. no. 423, 70th Cong., 2d sess.
Keywords: Blast furnaces; Labor productivity