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- Coal mines and mining
- History 33
- Social aspects 18
- Coal miners 14
- Social conditions 14
- Environmental aspects 12
- Coal 8
- Economic conditions 8
- Mountaintop removal mining 8
- Safety measures 8
- Welsh Americans 8
- Family 6
- Mines and mineral resources 6
- Travel 6
- Aspect social 4
- Charbon 4
- Citizen participation 4
- Coal mine accidents 4
- Coal trade 4
- Community activists 4
- Company towns 4
- Landscape protection 4
- Law and legislation 4
- Mine explosions 4
- Mineurs de charbon 4
- Agriculture 2
- Americains d'origine galloise 2
- Appalachians (People) 2
- Britanniques 2
- British 2
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