Source: National Industrial Conference Board, For December 1924-June 1936 Data:"Wages, Hours, And Employment In The United States, 1914-1936", Nicb Study No. 229, 1936; For July 1936-1937 Data: Supplement To Nicb Service Letter, June 1938; For 1938-September 1941 Data: Nicb Economic Record, March,28, 1940, And Following Issues; For October 1941-1942: Nicb Management Records.
This NBER data series m08223 appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: m08223
Release: NBER Macrohistory Database
National Bureau of Economic Research, Average Hourly Earnings, Machine and Machine Tool Manufacturing for United States [M08223USM259NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M08223USM259NNBR/, November 28, 2015.