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Ordnance survey map 1:2,500
OS map: Rhymney Limestone Railway. Mine pits 1 and 2, Bryn Pwllog, Pantywann Colliery, Nantllesg Colliery, Gwellt Pits. Gelligaer and Merthyr parishes. Glamorgan Sheet X.15, Monmouth Sheet VI.15 [photocopy]. 25", 1873.
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