Source: Douglas, Real Wages In The United States, 1890-1926, P. 26. Original Source Is U.S. Bureau Of Labor Bulletin No. 77, P. 7.
This NBER data series a08066 appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: a08066
Release: NBER Macrohistory Database
National Bureau of Economic Research, Relative Hourly Wage Rates In Manufacturing and Mechanical Industries for United States [A08066USA315NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/A08066USA315NNBR/, October 12, 2015.