Gwyddoniaeth
Subtitle: cardiau natur
By: gan Dennis Jones a Wyn Owens ; graffigwaith: Keith Cordell. Hydref.
Contributors: Owens, G. Wyn.
Publisher: Canolfan Technoleg Addysg Clwyd
Published: 1977
Place of publication: Yr Wyddgrug
Language: eng
Number of pages: 23