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Arg. Saesneg gwreiddiol = Original English ed.: Cambridge : Cambridge University Press, 1986.
Ar waelod teitl y clawr = At foot of cover title: Yr Asiantaeth Hyfforddi, CBAC [i.e. Training Agency, WJEC].
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Geneteg. Published by Cyd-Bwyllgor Addysg Cymru in 1995. Publication and catalogue information, links to buy online and reader comments.