Cyfyngwch eich canlyniadau yn ôl:
- Pob un
- Lhuyd, Edward, 1660-1709, 1 canlyniadau
- Peate, Iorwerth Cyfeiliog, 1901-1982, 1 canlyniadau
- Owen, Bob, 1885-1962, 1 canlyniadau
- Richards, Mary, 1885-1977, 1 canlyniadau
- Peate, Iorwerth Cyfeiliog, 1901-1982 -- Correspondence, 1 canlyniadau
- Ingram, G.C.S. (Geoffrey Cheselden S.), 1881-1971 -- Correspondence, 1 canlyniadau
- Brook, Arthur, 1886-1957 -- Correspondence., 1 canlyniadau
- Owen, Bob, 1885-1962 -- Correspondence, 1 canlyniadau
- Owen, J.H., d. 1959 -- Correspondence, 1 canlyniadau
- Ingram, G.C.S. (Geoffrey Cheselden S.), 1881-1971,, 1 canlyniadau
- Pob un
- European polecat, 4 canlyniadau
- Seals (Animals), 2 canlyniadau
- Snowdonia National Park (Wales), 1 canlyniadau
- Ynys-hir Nature Reserve (Ceredigion, Wales), 1 canlyniadau
- Bird watching -- Wales -- Bardsey Island., 1 canlyniadau
- Milvus -- Europe, 1 canlyniadau
- Mountain plants -- Wales -- Snowdonia, 1 canlyniadau
- Pine marten, 1 canlyniadau
- Badgers, 1 canlyniadau
- Bats, 1 canlyniadau
