The 1981 world book year book. : the annual supplement to the world book encyclopedia.

Eitemau Tebyg

• The 1981 world book year book. : the annual supplement to the world book encyclopedia.
  Cyhoeddwyd: (1981)
• The 1977 world book year book. : the annual supplement to the world book encyclopedia.
  Cyhoeddwyd: (1977)
• The 1978 world book year book. : the annual supplement to the world book encyclopedia.
  Cyhoeddwyd: (1978)
• The 1979 world book year book. : the annual supplement to the world book encyclopedia.
  Cyhoeddwyd: (1979)
• The 1982 world book year book. : the annual supplement to the world book encyclopedia.
  Cyhoeddwyd: (1982)