Series Is Presented Here As Two Variables--(1)--Original Data, 1920-1942 (2)--Original Data, 1947-1956. This Segment Is Roughly Comparable To The Nicb One In Industry Coverage, However, It Also Includes Products Made From Synthetic Rubber. Source: Bureau Of Labor Statistics: For 1947-1952, "Employment, Hours, And Earnings, " Manufacturing Division, Nondurable Goods Subdivision, Rubber Products, Releases Ls53-2339, February 1953 And April 1954; For 1953-1956, June 1956 Release, The Monthly Labor Review And "Employment And Earnings."
This NBER data series m08218b appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: m08218b
Release: NBER Macrohistory Database
National Bureau of Economic Research, Average Actual Hours of Work Per Week, Rubber Products Manufacturing for United States [M0818BUSM065NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M0818BUSM065NNBR/, July 3, 2015.