Increased production / E. Lipson. Lipson, E. (Ephraim), 1888-1960. Industries. Labor productivity. Industrial efficiency. HB172 .L73 338.01 LII Bibliography: p. [72]. London, New York [etc.] : H. Milford University Press, 1921. 1921. 1921 Text 71, [1] p. ; eng The World of to day, [11]