Cyfres mathemateg Cambria.
By: paratowyd gan y Gyfadran Addysg, Coleg Prifysgol Cymru, Aberystwyth.
Contributors: University College of Wales. Department of Education.
Publisher: D. Brown a'i Feibion
Published: 1980
Place of publication: Y Bontfaen
Language: wel
Number of pages: 43