| GMD | Text |
| Classification | 574.92 Sa56 |
| Publisher | Ladybird, Loughborough, [Englnd], c1979 |
| Subject | Marine ecology -- Juvenile literature.Seashore ecology -- Great Britain -- Juvenile literature.Marine ecology. |
| Series | Conservation., Series 727. |
| Description | 50 p. : col. ill. ; 18 cm. |
| ISBN | 9780721405056 |
| Additional ISBN | 0721405053 |