Science Progress vol.LIV, nos.1-4

Eitemau Tebyg

• Journal of Geology, vol.LIV, Nos.1-6
  gan: University of Chicago
  Cyhoeddwyd: (1946)
• Science Progress vol.XLIX, nos.1-4
  gan: Black Well Scientific Publications, Oxford
  Cyhoeddwyd: (1961)
• Science Progress vol.L, nos.1-4
  gan: Black Well Scientific Publications, Oxford
  Cyhoeddwyd: (1962)
• Science Progress vol.LI, nos.1-4
  gan: Black Well Scientific Publications, Oxford
  Cyhoeddwyd: (1963)
• Science Progress vol.LII, nos.1-4
  gan: Black Well Scientific Publications, Oxford
  Cyhoeddwyd: (1964)