1. 1973
2. The effects of trampling and vehicles on natural vegetation.

   Liddle, M. (Awdur), P. Greig-Smith, P. (Goruchwylydd), Mai 1973

   Traethawd ymchwil myfyriwr: Doethur mewn Athroniaeth

3. 1970
4. Studies on organ cultures of slug reproductive tracts

   Bailey, T. G. (Awdur), Medi 1970

   Traethawd ymchwil myfyriwr: Doethur mewn Athroniaeth

5. 1968
6. A comparative study of morphology, behaviour and ecology of Chaetogaster Limnaei ( von Baer) from several host species

   Buse, A. (Awdur), Medi 1968

   Traethawd ymchwil myfyriwr: Doethur mewn Athroniaeth

7. 1966
8. Studies in the flora of the Rhynie chert

   Saadawy, W.E.-S. (Awdur), Meh 1966

   Traethawd ymchwil myfyriwr: Doethur mewn Athroniaeth

9. Studies on plant microfossils from the Carboniferous of North Wales

   Hibbert, F. A. (Awdur), Ebr 1966

   Traethawd ymchwil myfyriwr: Doethur mewn Athroniaeth

10. Studies on fossil plants of Karoo age from Central & Southern Africa

    Williams, P. (Awdur), Ion 1966

    Traethawd ymchwil myfyriwr: Doethur mewn Athroniaeth

11. The genetics and evolution of differences between closely adjacent plant populations, with special reference to heavy metal tolerance

    Antonovics, J. (Awdur), Ion 1966

    Traethawd ymchwil myfyriwr: Doethur mewn Athroniaeth

12. Studies on the nutrition and feeding of the larvae of the large cabbage white butterfly, Pieris brassicae L.

    Akhtar, M. (Awdur), 1966

    Traethawd ymchwil myfyriwr: Doethur mewn Athroniaeth

13. 1965
14. Comparative studies in the pathology of radiomimetic conditions

    Mason, J. (Awdur), Medi 1965

    Traethawd ymchwil myfyriwr: Doethur mewn Athroniaeth

15. 1963
16. An ecological study of Chaetogaster limnaei( von Baer)

    Gruffydd, L. D. (Awdur), Ebr 1963

    Traethawd ymchwil myfyriwr: Doethur mewn Athroniaeth