Ein hymdriniaeth o wyddoniaeth gynradd
By: Cyngor Sir Dyfed, Adran Addysg.
Contributors: Dyfed (Wales). Education Department.
Publisher: Cyngor SirDyfed
Published: 1992
Place of publication: Caerfyrddin
Language: eng
Number of pages: 119
Subjects: Science -- Study and teaching (Elementary)
Notes: Llyfryddiaeth = Bibliography: p118-119.