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    Carreg Ddu viaduct and Foel Valve Tower, looking north. Photographed as part of Archaeological Desk Based Assessment of Afon Claerwen, Elan Valley, Rhayader, Powys. Assessment conducted by Archaeology Wales in 2018. Report no. 1681. Project no. 2573.Opsiynau lawrlwytho a prynu
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    NPRNTeitlMath O SafleArchifauDelweddauNPRN752TeitlGarreg-Ddu Dam, Elan Valley Water Scheme;Carreg Ddu Viaduct and Submerged DamMath O SafleARGAEArchifau60Delweddau40NPRN32527TeitlElan Aqueduct: Foel Valve Tower; Garreg-Ddu Reservoir Tower, Foel TunnelMath O SafleTŴR Y FALFIAUArchifau19Delweddau14