Cyfyngwch eich canlyniadau yn ôl:
- Pob un
- Insects, 3 canlyniadau
- Birds, 2 canlyniadau
- Mammals, 2 canlyniadau
- Plants, 2 canlyniadau
- Fishes, 1 canlyniadau
- Shellfish, 1 canlyniadau
- English language -- Glossaries, vocabularies, etc. -- Welsh, 1 canlyniadau
- Natural history, 1 canlyniadau
- World War, 1939-1945, 1 canlyniadau
- Nature conservation -- Wales, 1 canlyniadau