Source: Bureau Of The Census, "Business Cycle Developments, " November 1965 And Subsequent Issues.
This NBER data series q09087 appears on the NBER website in Chapter 9 at http://www.nber.org/databases/macrohistory/contents/chapter09.html.
NBER Indicator: q09087
Release: NBER Macrohistory Database
National Bureau of Economic Research, Gross Retained Earnings of Nonfinancial Corporations, Flow of Funds Accounts for United States [Q09087USQ405SNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/Q09087USQ405SNBR/, August 4, 2015.