OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Cysgodion ar y pared : cyfrol o wyth ysgrif by John Gruffydd Jones. ISBN 085088585X. Published by Cyhoeddwyd dros Lys yr Eisteddfod Genedlaethol gan Wasg Gomer in 1981. Publication and catalogue information, links to buy online and reader comments.
