Data and Reports, filed by Llywelyn Phillips, March 1973, Ychwanegu i'r clipfwrdd D6. Cyfres 1932-1948. Rhan oWelsh Plant Breeding Station (WPBS) Archives,
Contributions to presentations to members of staff, Welsh Plant Breeding Station, Ychwanegu i'r clipfwrdd C48. Cyfres 1961-1970. Rhan oWelsh Plant Breeding Station (WPBS) Archives,
R-S (incl. staff files) Ychwanegu i'r clipfwrdd A36. Cyfres 1961. Rhan oWelsh Plant Breeding Station (WPBS) Archives,
D-F Ychwanegu i'r clipfwrdd A7. Cyfres 1956-1976. Rhan oWelsh Plant Breeding Station (WPBS) Archives,
M (part)-N Ychwanegu i'r clipfwrdd A27. Cyfres 1959. Rhan oWelsh Plant Breeding Station (WPBS) Archives,
Meadow foxtail (Bh). Ychwanegu i'r clipfwrdd E18. Cyfres Rhan oWelsh Plant Breeding Station (WPBS) Archives,
Miscellaneous, Ychwanegu i'r clipfwrdd E33. Cyfres 1939-1947. Rhan oWelsh Plant Breeding Station (WPBS) Archives,
Blocks, Ychwanegu i'r clipfwrdd E44. Cyfres 1929-1960. Rhan oWelsh Plant Breeding Station (WPBS) Archives,
Lotus spp (Al). Ychwanegu i'r clipfwrdd E8. Cyfres Rhan oWelsh Plant Breeding Station (WPBS) Archives,
Cocksfoot (Bc). Ychwanegu i'r clipfwrdd E14. Cyfres Rhan oWelsh Plant Breeding Station (WPBS) Archives,
Crested dog's tail (Bg). Ychwanegu i'r clipfwrdd E17. Cyfres Rhan oWelsh Plant Breeding Station (WPBS) Archives,