The series comes from the 'Current Population Survey (Household Survey)'
The source code is: LNS11324230
Source: US. Bureau of Labor Statistics
Release: Employment Situation
US. Bureau of Labor Statistics, Civilian Labor Force Participation Rate: 55 years and over [LNS11324230], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/LNS11324230/, August 3, 2015.
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