Series Is Presented Here As Three Variables--(1)--Seasonally Adjusted Data, 1921-1941 (2)--Original Data, 1929-1945 (3)--Seasonally Adjusted Data, 1946-1970. Source: Data Is Direct From Barger And Klein Files, U.S. Department Of Commerce
This NBER data series q08168a appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: q08168a
Release: NBER Macrohistory Database
National Bureau of Economic Research, Personal Income for United States [Q0868AUSQ027SNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/Q0868AUSQ027SNBR/, July 30, 2015.