This Series Ends On The 1923-1925=100 Base, And The New Revised Series Starts In 1939 On A 1939 Base. Source: For 1919-1930, Bureau Of Labor Statistics, Bulletin 610, Pp. 106, 78-79; For 1931-1934, Bureau Of Labor Statistics, Mimeographed Release, September, 1938, "Revised Index Of Numbers Of Factory Employment And Payrolls;" For 1935-1939, Bureau Of Labor Statistics, Mimeographed Release, May, 1940; For 1940-1942, Bureau Of Labor Statistics, "Employment And Payrolls" And Monthly Labor Review, Thereafter.
This NBER data series m08128 appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: m08128
Release: NBER Macrohistory Database
National Bureau of Economic Research, Index of Factory Payrolls, Paper and Pulp for United States [M08128USM331NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M08128USM331NNBR/, December 1, 2015.