Cyfyngwch eich canlyniadau yn ôl:
- Pob un
- Welsh language, 1 canlyniadau
- Coal miners -- Diseases -- Wales, South., 1 canlyniadau
- Coal mines and mining -- Wales, 1 canlyniadau
- Decentralization in government -- Wales, 1 canlyniadau
- Television broadcasting -- Wales, 1 canlyniadau
- Water-supply -- Wales, 1 canlyniadau
- Lungs -- Dust diseases -- Wales, 1 canlyniadau