Cyfyngwch eich canlyniadau yn ôl:
- Pob un
- Wages -- Coal miners -- Wales, South., 1 canlyniadau
- Collective bargaining -- Coal mining industry -- Wales., 1 canlyniadau
- Collective labor agreements -- Coal mining industry -- Wales., 1 canlyniadau
- Coal miners -- Labor unions -- Wales, South., 1 canlyniadau
- Labor- management committees -- Wales, South., 1 canlyniadau
- Committees -- Wales., 1 canlyniadau