The 1980 world book year book.

Eitemau Tebyg

• The 1980 world book year book.
  Cyhoeddwyd: (1980)
• The 1983 world book year book. : the annual supplement to the world book encyclopedia.
  Cyhoeddwyd: (1983)
• The 1984 world book year book. : the annual supplement to the world book encyclopedia.
  Cyhoeddwyd: (1984)
• The 1985 world book year book. : the annual supplement to the world book encyclopedia.
  Cyhoeddwyd: (1985)
• The 1987 world book year book. : the annual supplement to the world book encyclopedia.
  Cyhoeddwyd: (1987)