Source: U.S. Bureau Of The Census, J. Shiskin, Printout No. L 400, X-9 Program, January 1963; Latest Figures Are From "Business Survey Report"
This NBER data series m05115 appears on the NBER website in Chapter 5 at http://www.nber.org/databases/macrohistory/contents/chapter05.html.
NBER Indicator: m05115
Release: NBER Macrohistory Database
National Bureau of Economic Research, Percent of Members Reporting Higher Inventories of Purchased Materials for United States [M05115USM156NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M05115USM156NNBR/, August 1, 2015.