Series Is Presented Here As Two Variables-- (1)--Original Data, 1920-1942 (2)--Original Data, 1947-1954. Source: June, 1920-1931: Wages, Hours And Employment In The United States, 1914-1936 (National Industrial Conference Board Studies, No. 229, 1936); 1932-1933: Supplement To Conference Board Service Letter, June, 1938; 1934-1935: Conference Board Economic Record, March 28, 1940; 1936-1942: Conference Board Management Record, February, 1945.
This NBER data series m08221a appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: m08221a
Release: NBER Macrohistory Database
National Bureau of Economic Research, Index of Factory Payrolls, Rubber Products for United States [M0821AUSM330NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M0821AUSM330NNBR, February 12, 2016.