Source: US. Bureau of Labor Statistics
Release: Employment Situation
The series comes from the 'Current Population Survey (Household Survey)'
The source code is: LNU03032230
US. Bureau of Labor Statistics, Unemployment Level: Mining, quarrying, and oil and gas extraction, Nonagricultural Private Wage and Salary Workers [LNU03032230], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/LNU03032230, August 30, 2016.