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Llyfryddiaeth = Bibliography: p248-250. - Yn cynnwys mynegai = Includes index.
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Atlas geirfaol Brycheiniog by Glyn E. Jones. ISBN 0952753308. Published by Adran y Gymraeg, Prifysgol Cymru, Caerdydd in 1996. Publication and catalogue information, links to buy online and reader comments.