Barclay, W.J.. 2005 Heol Senni quarry, Powys (SN 915 221). In: Barclay, William; Browne, Michael; Macmillan, A.A.; Pickett, E.A.; Stone, Philip; Wilby, Philip, (eds.) The Old Red Sandstone of Great Britain. Joint Nature Conservation Committee, 250-253.
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