Release: NBER Macrohistory Database
Source: National Industrial Conference Board: For 1924-1936, "Wages, Hours, And Employment On The United States, 1914-1936" (Nicb Studies No. 229, 1936); For 1937, Supplement To Nicb Service Letter, June 1938; For 1938-1941, Nicb Economic Record, March 28, 1940 And Following Issues; For 1942, Nicb Management Records.
This NBER data series m08226 appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: m08226
National Bureau of Economic Research, Average Actual Hours of Work Per Week, Heavy Equipment Manufacturing for United States [M08226USM065NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/M08226USM065NNBR, October 22, 2016.