Cyfyngwch eich canlyniadau yn ôl:
- Pob un
- Lhuyd, Edward, 1660-1709, 1 canlyniadau
- National Trust in Wales, 1 canlyniadau
- West Wales Naturalists' Trust, 1 canlyniadau
- National Trust in Wales -- Correspondence, 1 canlyniadau
- West Wales Naturalists' Trust -- Correspondence., 1 canlyniadau
- Scott, Peter, 1909-1989 -- Correspondence., 1 canlyniadau
- Soper, Tony, ca 1940-, 1 canlyniadau