Series Is Presented Here As Two Variables--(1)--Original Data, 1920-1942 (2)--Original Data, 1934-1956. This Series Can Be Extended Through July 1948, When The Nicb Discontinued Compilation Of Its Payroll Statistics (See The Management Record Of October 1948, P. 504). The Next Segment (Computed By Bls) Is Considered To Be Roughly Comparable In Industry Coverage. Source: National Industrial Conference Board: For 1920-1933, "Wages, Hours, And Employment In The United States", 1914-1936 (Nicb Studies, No. 229, 1936); For 1934-1942, Tables Furnished By Nicb.
This NBER data series m08201a appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: m08201a
Release: NBER Macrohistory Database
National Bureau of Economic Research, Average Actual Hours of Work Per Week, Automobile Manufacturing for United States [M0801AUSM065NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M0801AUSM065NNBR/, August 3, 2015.