Byd bregus
By: ysgrifennwyd gan James Marsh ; golygwyd gan Nicole Carmichael ; addaswyd i'r Gymraeg gan Esyllt Penri.
Contributors: Carmichael, Nicole.; Penri, Esyllt.
Publisher: Gwasg Addysgol Cymru
Published: 1999
Place of publication: [Caerdydd]
Language: wel
Number of pages: 32
Subjects: Environmental protection -- Juvenile literature.
Genres: Juvenile literature.
Work titles: Earth alert.
Notes: Argraffiad Saesneg gwreiddiol = Original English edition : London : Two-Can Publishing, 1995.

Addasiad Cymraeg gan = Welsh adaptation by : Esyllt Penri.

Yn cynnwys mynegai = Includes index.

Addasiad Cymraeg o = Welsh adaptation of : Earth alert.