Series Is Presented Here As Two Variables--(1)--Original Data, 1939-1945 (2)--Seasonally Adjusted Data, 1946-1968. Unadjusted Figures Were Multiplied By Four To Derive Quarterly Totals At Annual Rates. Source: For 1939-1945 Data: Survey Of Current Business, Supplement: National Income, 1954 Edition.
This NBER data series q08281a appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: q08281a
Release: NBER Macrohistory Database
National Bureau of Economic Research, National Income for United States [Q0881AUSQ027NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/Q0881AUSQ027NNBR/, October 9, 2015.