Cyfyngwch eich canlyniadau yn ôl:
- Pob un
- Historical Association (Great Britain), 2 canlyniadau
- National Museum of Wales., 1 canlyniadau
- National Library of Wales., 1 canlyniadau
- University of Wales., 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
- University of Wales, Aberystwyth., 1 canlyniadau
- Pob un
- Education -- Wales., 1 canlyniadau
- 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
- History -- Study and teaching -- Wales., 1 canlyniadau
