Yn cynnwys mynegai = Includes index.
Cynllun Parc Cenedlaethol Bannau Brycheiniog : trydydd argraffiad 1993-98 = Brecon Beacons National Park plan : third edition 1993-98 by Brecon Beacons National Park Authority. ISBN 0905293126. Published by Parc Cenedlaethol Bannau Brycheiniog in 1993. Publication and catalogue information, links to buy online and reader comments.