1. 1963
2. An ecological study of Chaetogaster limnaei( von Baer)

   Awdur: Gruffydd, L. D., Ebr 1963

   Traethawd ymchwil myfyriwr: Doethur mewn Athroniaeth

3. 1959
4. Calcareous algae of the silurian of the Welsh border

   Awdur: Green, H., Ebr 1959

   Traethawd ymchwil myfyriwr: Doethur mewn Athroniaeth

5. 1958
6. A Study in the Experimental Taxonomy of some British Sphagha (section Cuspidata),with observations of their ecology.

   Awdur: Agnew, S., 5 Mai 1958

   Traethawd ymchwil myfyriwr: Doethur mewn Athroniaeth