Trydan
By: (cynhyrchwyd gan dîm project y Cyngor Ysgolion ; cyfarwyddwr Merfyn Griffiths ; dirprwy gyfarwyddwr G. Wyn Owens ; eglurebau gan Design Practitioners).
Contributors: Griffiths, Merfyn.; Owens, G. Wyn.
Series: Holi ac arbrofi
Publisher: Hodder and Stoughton (ar ran) Cyngor Ysgolion; Hodder Arnold H& S
Published: 1975
Place of publication: London
Language: wel
Number of pages: 18
Subjects: Electricity -- Juvenile literature.