This Index Covers 47 Of The Largest Of 149 Labor Market Areas Listed As "Labor Market And Employment Security." Source: G.H. Moore, Business Cycle Indicators, Vol. 2, NBER, P. 157
This NBER data series m16081 appears on the NBER website in Chapter 16 at http://www.nber.org/databases/macrohistory/contents/chapter16.html.
NBER Indicator: m16081
Release: NBER Macrohistory Database
National Bureau of Economic Research, Diffusion Index, Initial Claims For Unemployment Insurance, Forty-Seven Areas, Inverted, Three Month Span for United States [M16081USM509SNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M16081USM509SNBR/, September 4, 2015.