OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Llyfryddiaeth geiriaduron termau by Delyth Prys. ISBN 0904567427. Published by Canolfan Safoni Termau, Prifysgol Cymru, Bangor in 1995. Publication and catalogue information, links to buy online and reader comments.
