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Amgueddfa Cymru – Museum Wales
Llanbradach - Bedwas area, geological survey map, 2nd edition, 1901
Ordnance Survey Map, Geological Survey of England and Wales Second Edition 1901. Glamorgan Sheet XXIX S.W Monmouthshire Sheet XXVII S.W. Scale, six inches to one statute mile or 880 feet to one inch - 1/10560.