This Index Includes All Two-Digit Manufacturing Industries Listed In The 1957 Standard Industrial Manual. Source: G.H. Moore, Business Cycle Indicators, Vol. 2, NBER, P. 156
This NBER data series m16080 appears on the NBER website in Chapter 16 at http://www.nber.org/databases/macrohistory/contents/chapter16.html.
NBER Indicator: m16080
Release: NBER Macrohistory Database
National Bureau of Economic Research, Diffusion Index, Average Workweek, Twenty-One Manufacturing Industries, Three Month Span for United States [M16080USM509SNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M16080USM509SNBR, February 9, 2016.