- Coal mines and mining✖[remove]1,971
- Coal miners1,672
- United Mine Workers of America1,150
- Coal mine accidents1,125
- Coal mines and mining--Safety measures1,029
- Strikes and lockouts--Coal mining1,017
- Coal mines and mining--Law and legislation1,008
- International Union of Mine, Mill, and Smelter Workers1,008
- Congress of Industrial Organizations (U.S.)507
- Labor Unions507
- Labor movement507
- Coal mines and mining--Equipment and supplies325
- Coal miners--Labor unions133
- Collective labor agreements--Coal mining industry121
- Consolidation Coal Company101
- Coal miners--Death42
- Coal--Transportation37
- Coal miners--Housing32
- Bethlehem Steel Corporation31
- Working animals27
