P1042 Yn cynnwys cyfeiriadau llyfryddol = Includes bibliographical references.
P1073 Testun Cymraeg/Saesneg tête-bêche = Welsh/English text tête-bêche.
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Arolygon defnydd Iaith 2004-06 = The Welsh language use survey of 2004-6. ISBN 9780953533459. Published by Bwrdd yr Iaith Gymraeg in 2008. Publication and catalogue information, links to buy online and reader comments.