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