Llyfr y gwyddonydd ifanc am jetiau
By: (testun gwreiddiol gan Mark Hewish) ; (addasiad Cymraeg gan Marged Dafydd).
Contributors: Hewish, Mark.
Publisher: Elfen
Published: 1982
Place of publication: (Blaenan Ffestiniog)
Language: wel
Number of pages: 32
Subjects: Jet planes -- Juvenile literature.
Notes: Text on inside cover.