Cyfyngwch eich canlyniadau yn ôl:
- Pob un
- Williams, Gwilym Owen., 1 canlyniadau
- Nicholas, James, 1 canlyniadau
- Jenkins, Emyr, 1938-, 1 canlyniadau
- University of Wales., 1 canlyniadau
- Rees, Alwyn D., 1 canlyniadau
- Hughes, Glyn Tegai, 1 canlyniadau
- British Broadcasting Corporation., 1 canlyniadau
- Evans, Gwynfor, 1 canlyniadau
- Cledwyn of Penrhos, Cledwyn Hughes, Baron, 1916-2001, 1 canlyniadau
- S4C (Firm), 1 canlyniadau
- Pob un
- Broadcasting -- Wales., 2 canlyniadau
- Television broadcasting -- Wales., 2 canlyniadau
- Education, Bilingual -- Wales., 1 canlyniadau
- Welsh language -- Usage., 1 canlyniadau
- Welsh language -- Political aspects., 1 canlyniadau
- Traffic signs & signals -- Wales., 1 canlyniadau
- Census., 1 canlyniadau
- Demographic surveys -- Wales., 1 canlyniadau
