Source: U.S. Bureau of Labor Statistics
Release: Employment Situation
The series comes from the 'Current Population Survey (Household Survey)'
The source code is: LNU04032222
U.S. Bureau of Labor Statistics, Unemployment Rate: Natural Resources, Construction, and Maintenance Occupations [LNU04032222], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/LNU04032222, April 26, 2018.