Yn cynnwys mynegai = Includes index.
Mapiau tu mewn i'r cloriau = Maps on inside covers.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Geiriadur Gomer i'r ifanc by D. Geraint Lewis. ISBN 1859021611. Published by Gomer in 1994. Publication and catalogue information, links to buy online and reader comments.
