Draig yn y Cwpwrdd (Llyfrau Posau ac Antur i'r Ifanc S.)
by Karen Dolby, Caroline Jayne Church, Gwyn Griffiths
ISBN 13: 9781859022429
Format: Paperback (32 pages) Publisher: Gomer Press Published: 04 Sep 1995
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Gwlad Fy Nhadau: Ieuan, Iago, Eu Hoes A'u Hamserau
by Gwyn Griffiths
ISBN 13: 9781845270971
Format: Paperback (160 pages) Publisher: Gwasg Carreg Gwalch Published: 07 Jun 2006
Technology and Applications of Autonomous Underwater Vehicles (Ocean Science and Technology)
ISBN 13: 9780415301541
Format: Hardcover (368 pages) Publisher: CRC Press Published: 28 Nov 2002