Source: U.S. Bureau Of The Census, Data For 1947-1952: Derived From Series (Gross Private Domestic Investment, Change In Business Inventories, Current Prices) And Manufacturers' Unfilled Orders Converted To Quarterly Totals At Annual Rates From U.S. Census Series M3-1, Supplement 2; Data For 1953-July 1968: Series M3-1, Annual And Monthly Releases
This NBER data series q05127 appears on the NBER website in Chapter 5 at http://www.nber.org/databases/macrohistory/contents/chapter05.html.
NBER Indicator: q05127
Release: NBER Macrohistory Database
National Bureau of Economic Research, Change In Business Inventories Plus Change In Manufacturers' Unfilled Orders, Total for United States [Q05127USQ244SNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/Q05127USQ244SNBR/, October 4, 2015.