Data Are Averages Of Weekly Figures. Split-Weeks Are Prorated According To The Number Of Days In The Month. Alaska And Hawaii Are Covered For The Entire Period; Puerto Rico Is Not Included. Source: U.S. Department Of Labor, Bureau Of Employment Security, Data For 1948-1961 Are From Bes Files; Data For 1962-1969 Are From"Unemployment Insurance Claims", A Weekly Publication.
This NBER data series m08297 appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: m08297
Release: NBER Macrohistory Database
National Bureau of Economic Research, Initial Claims, Unemployment Insurance, State Programs for United States [M08297USM548NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M08297USM548NNBR/, September 2, 2015.