Elsevier's dictionary of botany :

Eitemau Tebyg

• Elsevier's dictionary of aquaculture :
  gan: Marx, Cheryl E.
  Cyhoeddwyd: (1991)
• Elsevier's dictionary of financial terms in English, German, Spanish, French, Italian, and Dutch /
  Cyhoeddwyd: (1979)
• Elsevier's dictionary of industrial chemistry in six languages: English/American, French, Spanish, Italian, Dutch and German.
  Cyhoeddwyd: (1964)
• Dictionary of oriental philosophy /
  gan: Reyna, Ruth
  Cyhoeddwyd: (1984)
• A dictionary of useful and everyday plants and their common names.
  gan: Howes, F. N.
  Cyhoeddwyd: (1974)