Series Is Presented Here As 3 Variables: (1) Original Data, 1939-46; (2) Seasonally Adjusted Data, 1946-63; (3) Annual Data Only, 1946-63. Source:
This NBER data series a02198c appears on the NBER website in Chapter 2 at http://www.nber.org/databases/macrohistory/contents/chapter02.html.
NBER Indicator: a02198c
Release: NBER Macrohistory Database
National Bureau of Economic Research, Public New Construction Activity, Highways, Value In Constant Prices for United States [A0298CUSA382NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/A0298CUSA382NNBR/, August 3, 2015.