Series Is Presented Here As Two Variables--(1)--Original Data, 1920-1948 (2)--Seasonally Adjusted Data, 1932-1962. Data Represent Aggregate Manhours For The Survey Week In Each Month. Prior To March, 1945 The Term Wage Earner Rather Than Production Worker Was Used. Source: National Industrial Conference Board, For 1920-1931 Data: Wages, Hours, And Employment In The United States, 1914-1936, By Ada Beney, Nicb Studies No. 229, 1936; For 1932-1933 Data: Supplement To Nicb Service Letter, June, 1938, Table 8; For 1934-1935: Nicb Economic Record, March 28, 1940, Vol. 2, No. 10, Table 1; For 1936-1948: Nicb Management Record, February, 1945, Vol. 7, No. 2, Pp. 46-47, And Monthly Issues Thereafter.
This NBER data series m08265a appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: m08265a
Release: NBER Macrohistory Database
National Bureau of Economic Research, Index of Production Worker Manhours In Manufacturing, Total for United States [M0865AUSM330NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M0865AUSM330NNBR/, December 1, 2015.