Source: Simon Kuznets, National Income And Its Composition, 1919-1938, Volume Ii, 1941, Worksheets For Table C2, P.641.
This NBER data series a08190 appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: a08190
Release: NBER Macrohistory Database
National Bureau of Economic Research, Salaries In Construction for United States [A08190USA144NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/A08190USA144NNBR/, October 4, 2015.