- Strikes and lockouts--Coal mining✖[remove]1,067
- Coal miners1,051
- United Mine Workers of America1,023
- Coal mines and mining1,017
- Coal mine accidents1,013
- Coal mines and mining--Law and legislation1,008
- Coal mines and mining--Safety measures1,008
- International Union of Mine, Mill, and Smelter Workers1,008
- Congress of Industrial Organizations (U.S.)507
- Labor Unions507
- Labor movement507
- Coal Strike (Colorado : 1913-1914)30
- Labor union members10
- Coal miners--Death9
- Coal miners--Labor unions9
- Pittston Coal Company8
- Coal miners--Housing6
- Coal miners--Political activity5
- Coal miners--Social life and customs4
- Coal miners' spouses3
