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O.S. map of Glamorgan & Brecknockshire
O.S. map Brecknock Sheet XLIII.14 / Glamorgan Sheet III.14 Showing Wen Plenys, Ystradgynlais and Ynys-y-gernon Collieries, Gyrnos Brickworks and Ynyscedwyn Iron & Steel Works in the Upper Swansea Valley, 1877 Scale : 1:2500
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