P1073 Yn cynnwys llabed geirfa Cymraeg/Saesneg ar gefn y llyfr = Includes Welsh/English vocabulary flap at back of vol.
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Cyflym! : beth sy'n symud yn gyflym? by Bethan Clement. ISBN 9781908574671. Published by @ebol in 2012. Publication and catalogue information, links to buy online and reader comments.