Cyfyngwch eich canlyniadau yn ôl:
- Pob un
- Chater, A. O., 9 canlyniadau
- Benoit, Peter Michael, 1931-, 5 canlyniadau
- Condry, William, 1918-1998, 4 canlyniadau
- Lockley, R. M. (Ronald Mathias), 1903-2000, 4 canlyniadau
- Bowen, E. G. (Emrys George), 1900-, 3 canlyniadau
- Chater, A. O, 3 canlyniadau
- Thomas, R. S. (Ronald Stuart), 1913-2000, 2 canlyniadau
- Roberts, Evan, 1906-1991, 2 canlyniadau
- Vaughan, H.R.H. 1893-1978, 2 canlyniadau
- Condry, Penny, 1922-, 2 canlyniadau
- Pob un
- Chater, A. O. -- Correspondence., 14 canlyniadau
- Richards, Mary, 1885-1977, 9 canlyniadau
- Vaughan, H.R.H. 1893-1978, 8 canlyniadau
- Vaughan, Irene 1890-1993, 8 canlyniadau
- Evans, Evan Price, 1880-1959, 8 canlyniadau
- Lhuyd, Edward, 1660-1709, 7 canlyniadau
- Salmon, H. Morrey (Harry Morrey), 7 canlyniadau
- Condry, William, 1918-1998, 7 canlyniadau
- Chater, A. O., 7 canlyniadau
- Vaughan, H.R.H. 1893-1978 -- Correspondence, 6 canlyniadau
- Pob un
- Mountain plants -- Wales -- Snowdonia, 7 canlyniadau
- Bird watching -- Wales -- Bardsey Island., 6 canlyniadau
- Birds -- Wales, 5 canlyniadau
- Historic sites -- Wales, 5 canlyniadau
- Red kite -- Wales, 5 canlyniadau
- Landscape -- Wales, 4 canlyniadau
- Nature conservation -- Wales, 4 canlyniadau
- Naturalists -- Wales, 4 canlyniadau
- Natural history -- Wales -- Snowdonia, 4 canlyniadau
- European polecat, 4 canlyniadau
- Pob un
- Letters, 5 canlyniadau
- Clippings (Books, newspapers, etc.), 5 canlyniadau
- Newsletters, 3 canlyniadau
- Periodicals, 2 canlyniadau
- Adroddiadau, 2 canlyniadau
- Diaries, 1 canlyniadau
- Radio scripts, 1 canlyniadau
- Condolence notes, 1 canlyniadau
- Annual reports, 1 canlyniadau
- Television scripts, 1 canlyniadau
