1936-1940 Data Were Computed From Data In Statistics Of Income. The Figure For 1938 Given Here Is Adjusted To Conform To The 1937 Industrial Classification. The Figures For 1939 And 1940 Have Been Adjusted To Conform To The 1938 Standard Industrial Classification. The Figure For 1938, If Adjusted To The 1938 Standard, Would Be 2158. These Data Have Been Computed By NBER From The 1916 Report. The Total Given In The Source Is 4158 But 65 Is Deducted For Building Construction, Shipbuilding, Construction And Engineering (Which Were Included Elsewhere). See Crum, Corporate Earning Power, P. 327, For Check. Source: Bureau Of Internal Revenue, Statistics Of Income, 1916 And Succeeding Issues.
This NBER data series a09014 appears on the NBER website in Chapter 9 at http://www.nber.org/databases/macrohistory/contents/chapter09.html.
NBER Indicator: a09014
Release: NBER Macrohistory Database
National Bureau of Economic Research, Corporate Net Income, Manufacturers, Total for United States [A09014USA144NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/A09014USA144NNBR/, September 5, 2015.