  2005 - Allwedd Mathemateg Diwygiedig Tgau Canolradd 2 (Paperback) ISBN-13: 9781856448642 ISBN-10: 1856448649 ?  2004 - Allwedd Mathemateg Diwygiedig Tgau Canolradd 1 (Paperback) ISBN-13: 9781856448635 ISBN-10: 1856448630 ?  2002 - Llawlyfr Adolygu Mathemateg Llyfr Gwaith (Paperback) ISBN-13: 9781856446105 ISBN-10: 1856446107 ?  |
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