Cyfyngwch eich canlyniadau yn ôl:
- Pob un
- Chater, A. O., 2 canlyniadau
- Benoit, Peter Michael, 1931- -- Correspondence, 2 canlyniadau
- Vaughan, Irene 1890-1993, 2 canlyniadau
- Ratcliffe, Derek, 1929- -- Correspondence., 2 canlyniadau
- Ratcliffe, Derek, 1929-, 2 canlyniadau
- Benoit, Peter Michael, 1931- -- Correspondence., 2 canlyniadau
- Vaughan, Irene, 1890-1993 -- Correspondence., 2 canlyniadau
- Roberts, Evan, 1906-1991, 1 canlyniadau
- Lhuyd, Edward, 1660-1709, 1 canlyniadau
- Vaughan, H.R.H. 1893-1978, 1 canlyniadau
- Pob un
- Natural history -- Wales -- Snowdonia, 1 canlyniadau
- Landscape -- Wales -- Snowdonia, 1 canlyniadau
- Forests and forestry -- 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
- Snowdonia (Wales) -- Description and travel, 1 canlyniadau
- Forest conservation -- Wales., 1 canlyniadau