Cyfyngwch eich canlyniadau yn ôl:
- Pob un
- Ratcliffe, Derek, 1929- -- Correspondence., 3 canlyniadau
- Ratcliffe, Derek, 1929-, 3 canlyniadau
- Roberts, Evan, 1906-1991, 2 canlyniadau
- Chater, A. O., 2 canlyniadau
- Vaughan, Irene 1890-1993, 2 canlyniadau
- Evans, Evan Price, 1880-1959, 2 canlyniadau
- Benoit, Peter Michael, 1931- -- Correspondence., 2 canlyniadau
- Evans, Evan Price, 1880-1959 -- Correspondence., 2 canlyniadau
- Vaughan, Irene, 1890-1993 -- Correspondence., 2 canlyniadau
- Lhuyd, Edward, 1660-1709, 1 canlyniadau
- Pob un
- Botany -- Wales, 1 canlyniadau
- Naturalists -- Wales, 1 canlyniadau
- Natural history -- Wales -- Snowdonia, 1 canlyniadau
- Landscape -- Wales -- Snowdonia, 1 canlyniadau
- Geology -- Wales, 1 canlyniadau
- Mountain ecology -- Wales -- Cader Idris., 1 canlyniadau
- Mountain ecology -- Wales -- Plynlimon., 1 canlyniadau
- Mountain ecology -- Wales -- Snowdonia., 1 canlyniadau
- Mountain ecology -- Wales, South., 1 canlyniadau
- Tourism -- Wales -- Snowdonia, 1 canlyniadau
