Other poas (Bp). Ychwanegu i'r clipfwrdd E23. Cyfres Rhan oWelsh Plant Breeding Station (WPBS) Archives,
Various grasses (Bt), Ychwanegu i'r clipfwrdd E26. Cyfres 1922-1941. Rhan oWelsh Plant Breeding Station (WPBS) Archives,
Hybrids (Bx). Ychwanegu i'r clipfwrdd E27. Cyfres Rhan oWelsh Plant Breeding Station (WPBS) Archives,
Other experiments, Ychwanegu i'r clipfwrdd E35 E. Cyfres 1920-1941. Rhan oWelsh Plant Breeding Station (WPBS) Archives,
White clover (Ac). Ychwanegu i'r clipfwrdd E3. Cyfres Rhan oWelsh Plant Breeding Station (WPBS) Archives,
Melilotis alba (Ag). Ychwanegu i'r clipfwrdd E6. Cyfres Rhan oWelsh Plant Breeding Station (WPBS) Archives,
Perennial ryegrass (Ba), Ychwanegu i'r clipfwrdd E12. Cyfres 1922-1931. Rhan oWelsh Plant Breeding Station (WPBS) Archives,
