Cyfyngwch eich canlyniadau yn ôl:
- Pob un
- Housing development -- Wales, 1 canlyniadau
- Roads -- Wales, 1 canlyniadau
- Afforestation -- Wales, 1 canlyniadau
- Barrages -- Severn River (Wales and England), 1 canlyniadau
- Bridges -- Wales, 1 canlyniadau
- Historic buildings -- Conservation and restoration -- Wales, 1 canlyniadau
- Hydroelectric power plants -- Wales, 1 canlyniadau
- Industrial development projects -- Wales, 1 canlyniadau
- National parks and reserves -- Wales, 1 canlyniadau
- Nuclear power plants -- Wales, 1 canlyniadau