Cyfyngwch eich canlyniadau yn ôl:
- Pob un
- Borrow, George, 1803-1881, 1 canlyniadau
- Williams, Abraham, 1755-1828, 1 canlyniadau
- Vaughan, H.R.H. 1893-1978, 1 canlyniadau
- Chater, A. O., 1 canlyniadau
- Chater, A. O. -- Correspondence., 1 canlyniadau
- Vaughan, Irene, 1890-1993 -- Correspondence, 1 canlyniadau
- Vaughan, Irene 1890-1993, 1 canlyniadau
- Bowen, E. G. (Emrys George), 1900- -- Correspondence., 1 canlyniadau
- Miles, Philip M. ca. 1930- -- Correspondence, 1 canlyniadau
- Ratcliffe, Derek, 1929- -- Correspondence., 1 canlyniadau
- Pob un
- Bardsey Island (Wales), 6 canlyniadau
- Cardiganshire (Wales), 1 canlyniadau
- Merioneth (Wales), 1 canlyniadau
- Cadair Idris (Wales), 1 canlyniadau
- Nature conservation -- Wales, 1 canlyniadau
- Birds -- Wales, 1 canlyniadau
- Ynys-hir Nature Reserve (Ceredigion, Wales), 1 canlyniadau
- Historic sites -- Wales, 1 canlyniadau
- Geology -- Wales, 1 canlyniadau
- Industries -- Wales -- History, 1 canlyniadau
