P1073 Addasiad Cymraeg o = Welsh adaptation of: Bounce to it!.
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Hwb, cam a naid : (casgliad o ymchwiliadau mathemategol ar gyfer lefelau 3-6). 3, Naid ymhellach. ISBN 1857870077. Published by Canolfan Astudiaethau Iaith in 1993. Publication and catalogue information, links to buy online and reader comments.