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Darlith a draddodwyd yng nghynhadledd C.Y.G.M.A., 21 Medi 1991 = Lecture delivered in the C.Y.G.M.A., 21 September 1991.
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Gwybodaeth am iaith by Euros Jones Evans. ISBN 1856441970. Published by Cymdeithas y Gymraeg mewn Addysg in 1992. Publication and catalogue information, links to buy online and reader comments.