Series Is Presented Here As Two Variables--(1)--Original Data, 1919-1941 (2)--Original Data, 1939-1942. Data Are Adjusted To The 1939 Census Level. Source: Bureau Of Labor Statistics, "Employment And Payrolls".
This NBER data series m08127b appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: m08127b
Release: NBER Macrohistory Database
National Bureau of Economic Research, Index of Factory Payrolls, Boots and Shoes for United States [M0827BUSM346NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M0827BUSM346NNBR/, July 2, 2015.