Source: Simon Kuznets, "Capital In The American Economy: Its Formation And Financing, " (Princeton University Press For NBER, 1961), Table R-30
This NBER data series a02145 appears on the NBER website in Chapter 2 at http://www.nber.org/databases/macrohistory/contents/chapter02.html.
NBER Indicator: a02145
Release: NBER Macrohistory Database
National Bureau of Economic Research, Gross Private Construction, Excluding Nonfarm Residential, (Constant Dollars) for United States [A02145USA379NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/A02145USA379NNBR/, September 5, 2015.