The series comes from the 'Current Population Survey (Household Survey)'
The source code is: LNU04035109
Source: US. Bureau of Labor Statistics
Release: Employment Situation
US. Bureau of Labor Statistics, Unemployment Rate: Agricultural and Related Private Wage and Salary Workers [LNU04035109], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/LNU04035109/, August 3, 2015.