Source: US. Bureau of Labor Statistics
Release: Employment Situation
The series comes from the 'Current Population Survey (Household Survey)'
The source code is: LNU02032210
US. Bureau of Labor Statistics, Employment Level: Construction and Extraction Occupations [LNU02032210], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/LNU02032210, August 27, 2016.