Cynllun Parc Cenedlaethol Bannau Brycheiniog : trydydd argraffiad 1993-98 = Brecon Beacons National Park plan : third edition 1993-98.
Brecon Beacons National Park Authority.
Aberhonddu : Parc Cenedlaethol Bannau Brycheiniog,
1993.
Yn cynnwys mynegai = Includes index.
Brecon Beacons National Park Authority.
National parks and reserves