O dan y môr =
Subtitle: Underwater marine.
Contributors: Countryside Council for Wales.
Series: Cyfres cynefinoedd = -- Habitats series -- 3; Cyfres cynefinoedd -- 3.
Publisher: Cyngor Cefn Gwlad Cymru = Countryside Council for Wales
Published: 1999
Place of publication: Bangor
Language: eng
Number of pages: 1616
Subjects: Marine ecology -- Wales.
Other titles: Underwater marine.
Notes: Ar y clawr: Gwybodaeth = On cover: Information.

Llyfryddiaeth = Bibliography: p15-16,15-16.

Testun Cymraeg/Saesneg = Welsh/English text tête-bêche.