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'Darlith a draddodwyd yn Ysgol Penybryn, Bethesda, Mawrth 18ed, 1981'.
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Crwydro by John Ffrancon Griffith. ISBN 0904852288. Published by Gwasanaeth Llyfrgell Gwynedd in 1982. Publication and catalogue information, links to buy online and reader comments.