The series comes from the 'Current Population Survey (Household Survey)'
The source code is: LNU03035109
Source: US. Bureau of Labor Statistics
Release: Employment Situation
US. Bureau of Labor Statistics, Unemployment Level: Agricultural and Related Private Wage and Salary Workers [LNU03035109], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/LNU03035109/, August 29, 2015.