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Seiliwyd ar destun a chynllun gan Steve Tippell a Steve Simpson = Based on text and design by Steve Tippell and Steve Simpson.
Paratowyd ar ran y Swyddfa Gymreig gan y Swyddfa Hysbysrwydd Ganolog = Prepared on behalf of the Welsh Office by the Central Office of Information.
Y fersiwn Gymraeg gan Uned Gyfieithu'r Swyddfa Gymreig = Welsh version by the Welsh Office's Translation Unit.
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Cyffuriau a thoddyddion : arweiniad i berson ifanc. Published by Y Swyddfa Gymreig in 1994. Publication and catalogue information, links to buy online and reader comments.