Source: National Association Of Purchasing Agents, Data Furnished Directly From Source For 1955-1957; Thereafter Data Furnished By The "Business Survey, " Found In The First Issue Of Each Month Of The Bulletin Of The National Association Of Purchasing Agents.
This NBER data series m06099 appears on the NBER website in Chapter 6 at http://www.nber.org/databases/macrohistory/contents/chapter06.html.
NBER Indicator: m06099
Release: NBER Macrohistory Database
National Bureau of Economic Research, Buying Policy, Capital Expenditures, Percent Reporting, Commitments 6 Months Or Longer for United States [M06099USM156NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M06099USM156NNBR/, November 26, 2015.