Cyfyngwch eich canlyniadau yn ôl:
- Pob un
- National Museum of Wales., 1 canlyniadau
- Parry, Thomas, 1904-1985, 1 canlyniadau
- National Library of Wales., 1 canlyniadau
- University of Wales., 1 canlyniadau
- Hughes, Glyn Tegai, 1 canlyniadau
- Historical Association (Great Britain) -- Records and correspondence., 1 canlyniadau
- National Museum of Wales -- Records and correspondence., 1 canlyniadau
- National Library of Wales -- Archives., 1 canlyniadau
- University of Wales, Aberystwyth -- Archives., 1 canlyniadau
- University of Wales -- Archives., 1 canlyniadau
- Pob un
- National parks and reserves -- Wales., 1 canlyniadau
- Field experiments -- Wales., 1 canlyniadau
- Landscape -- Wales., 1 canlyniadau
- Nature conservation -- Wales., 1 canlyniadau
- Historic sites -- Monitoring -- Wales., 1 canlyniadau
- Agriculture -- Wales, 1 canlyniadau
- Demography -- Isle of Man., 1 canlyniadau
- Human settlements -- Isle of Man., 1 canlyniadau
- Rural Population -- Isle of Man., 1 canlyniadau
- Manx -- Race identity., 1 canlyniadau
