Series Is Presented Here As Two Variables--(1)--Seasonally Adjusted Data, 1919-1940 (2)--Seasonally Adjusted, 1948-1964. Data Were Derived From NBER Series 16002 (Index Of Six Leading Series, Amplitude Adjusted, Unweighted.) Source: J. Shiskin At NBER, Mimeographed Release Of January 25,1963
This NBER data series m16007a appears on the NBER website in Chapter 16 at http://www.nber.org/databases/macrohistory/contents/chapter16.html.
NBER Indicator: m16007a
Release: NBER Macrohistory Database
National Bureau of Economic Research, Adjusted Rates of Change of Composite Index of Leading Series, Six Series for United States [M1607AUSM156SNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M1607AUSM156SNBR/, July 3, 2015.