Source: Bureau Of Labor Statistics, For 1919-1939 Data: Bulletin No. 610; For 1931-1934 Data: Mimeographed Report, September 1938; For 1935-1939 Data: Mimeographed Report, May 1940; For 1940-1942:"Employment And Payrolls" And Monthly Labor Review.
This NBER data series m08094 appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: m08094
Release: NBER Macrohistory Database
National Bureau of Economic Research, Index of Factory Employment, Millinery for United States [M08094USM331NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M08094USM331NNBR/, August 30, 2015.