Release: NBER Macrohistory Database
Source: National Industrial Conference Board, For 1920-1931 Data: "Wages, Hours, And Employment In The United States, 1914-1936", Nicb Studies No. 229, 1936; For 1932-1933 Data: Supplement To Nicb Service Letter, June 1938; For 1934: Nicb Economic Record, March 28, 1940; For 1935-1942: Nicb Tables.
This NBER data series m08103aa appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: m08103aa
National Bureau of Economic Research, Index of Factory Employment, Boots and Shoes for United States [M083AZUSM330NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/M083AZUSM330NNBR, October 17, 2017.