Series Is Presented Here As Two Variables--(1)--Seasonally Adjusted Data, 1921-1939 (2)--Seasonally Adjusted Data, 1939-1968. Unadjusted Figures Were Multiplied By Four To Derive Totals At Annual Rates. Source: U.S. Department Of Commerce, Data For 1939-1945: "National Income, " 1954 Edition, A Supplement To The Survey Of Current Business; Data For 1946-1949: "U.S. Income And Output, " A Supplement To Scb, November 1958; Data For 1950-1968: Scb, August 1965 And Subsequent Issues; Alternate Soureces:"The National Income And Product Accounts Of The United States, 1929-1965, " Scb Supplement, August 1966; Scb, July 1967, Pp. 1 And 13
This NBER data series q05103b appears on the NBER website in Chapter 5 at http://www.nber.org/databases/macrohistory/contents/chapter05.html.
NBER Indicator: q05103b
Release: NBER Macrohistory Database
National Bureau of Economic Research, Gross Private Domestic Investment Change In Business Inventories for United States [Q0503BUSQ244SNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/Q0503BUSQ244SNBR/, October 8, 2015.