Humpage, A.J.. 2007 The bedrock geology of the Brecon Beacons and Usk Valley. In: Carr, S.J.; Coleman, C.G.; Humpage, A.J.; Shakesby, R.A., (eds.) The Quaternary of the Brecon Beacons. London, UK, Quaternary Research Association, 2-13. (QRA field guides).
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