Source: U.S. Bureau Of The Census
This NBER data series m16070 appears on the NBER website in Chapter 16 at http://www.nber.org/databases/macrohistory/contents/chapter16.html.
NBER Indicator: m16070
Release: NBER Macrohistory Database
National Bureau of Economic Research, Amplitude-Adjusted Composite Index of Twenty-Eight Weighted Leading Indicators for United States [M16070USM358SNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M16070USM358SNBR/, July 4, 2015.