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Teitl o glawr y pecyn = Title from pack cover.
Pecyn yn cynnwys: 1 cyfrol, 2 poster, 25 taflen waith = Pack contains: 1 volume, 2 posters, 25 worksheets.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Breuddwyd Macsen : prosiect technoleg y Ganolfan Astudiaethau Iaith cyfnod allweddol 2. ISBN 1857871014. Published by Canolfan Astudiaethau Iaith in 1994. Publication and catalogue information, links to buy online and reader comments.