Source: Data Were Derived From First Differences Of (Book Value Of Finished Goods Inventories). Data For December 1938-1952 Were Lowered To The Level Of Data For 1953 And Following Years, By The Ratio Of The Overlapping Year 1953 (0.81741).
This NBER data series m05121 appears on the NBER website in Chapter 5 at http://www.nber.org/databases/macrohistory/contents/chapter05.html.
NBER Indicator: m05121
Release: NBER Macrohistory Database
National Bureau of Economic Research, Change In Book Value of Finished Goods Inventories for United States [M05121USM027NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M05121USM027NNBR/, December 1, 2015.