Series Is Presented Here As Two Variables--(1)--Original Data, 1921-1943 (2)--Original Data, 1939-1956. This Series Can Be Extended Through 1950, When The Nicb Discontinued Its Compilation (See The Management Record Of April 1951, P. 151). The Bls Series Beginning In 1939 Is Believed To Be Roughly Comparable In Industry Coverage. Source: Computed By The National Industrial Conference Board From Data In Icc "Wage Statistics."
This NBER data series m08034a appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: m08034a
Release: NBER Macrohistory Database
National Bureau of Economic Research, Average Hours of Work Per Week, Class I Railroad Employees, All Wage-Earners for United States [M08J4AUSM065NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M08J4AUSM065NNBR/, September 2, 2015.