Secret of the sea

Eitemau Tebyg

• Survive the savage sea
  gan: Robertson, Dougal
• Man explores the sea
  gan: Dugan, James
• Galathea deep sea expedition
  gan: Bruun, Anton, F.
• Explorers of the pacific
  gan: Buck, Peter, H.
  Cyhoeddwyd: (1953)
• Silent world
  gan: Cousteav, J.V