OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Patrymau diwylliant a moes yn nheulu'r Wynniaid o Wedir by J. Gwynfor Jones. ISBN 0904852660. Published by Cyngor Sir Gwynedd, Gwasanaeth Llyfrgell in 1989. Publication and catalogue information, links to buy online and reader comments.
