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Amgueddfa Cymru – Museum Wales
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Ordnance survey map 1:2,500
OS map: Sirhowy Valley, Hollybush Colliery, Pontgwaith level (coal). Monmouth sheet (photocopy)? 25", 1877. Scale 1/2500 or 25.344 inches to a Statute mile or 208.33 feet to one inch.
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