P1073 Testun Cymraeg/Saesneg tête-bêche = Welsh/English text tête-bêche.
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Arolwg defnydd Iaith 2004 = 2004 Welsh language use survey. ISBN 0953533417. Published by Bwrdd yr Iaith Gymraeg in 2006. Publication and catalogue information, links to buy online and reader comments.