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    • Pen-y-Garreg Dam; Pen-y-Gareg Dam, Elan Valley Water Scheme
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    Digital copy of an albumen print from Edward Hubbard Collection showing Railway no.4 cutting looking north, taken October 1898.Digital copy of an albumen print from Edward Hubbard Collection showing the Pen y Garreg culvert outlet, taken May 1899.Digital copy of an albumen print from Edward Hubbard Collection showing the Pen y Garreg Dam from the left bank looking upstream, taken September 1898.Pen-y-Garreg reservoir and dam. Oblique aerial photograph taken during the Royal Commission's programme of archaeological aerial reconnaissance by Toby Driver on 3rd June 2015.Pen-y-Garreg reservoir, dam and valve tower. Oblique aerial photograph taken during the Royal Commission's programme of archaeological aerial reconnaissance by Toby Driver on 3rd June 2015.Pen-y-Garreg reservoir, dam and valve tower. Oblique aerial photograph taken during the Royal Commission's programme of archaeological aerial reconnaissance by Toby Driver on 3rd June 2015.Pen-y-Garreg reservoir, dam and valve tower. Oblique aerial photograph taken during the Royal Commission's programme of archaeological aerial reconnaissance by Toby Driver on 3rd June 2015.Pen-y-Garreg reservoir, dam and valve tower, pont Myllfan bridge and Pen-y-Bont house. Oblique aerial photograph taken during the Royal Commission's programme of archaeological aerial reconnaissance by Toby Driver on 3rd June 2015.Pen-y-Garreg reservoir, dam and valve tower. Oblique aerial photograph taken during the Royal Commission's programme of archaeological aerial reconnaissance by Toby Driver on 3rd June 2015.Pen-y-Garreg reservoir, dam and valve tower. Oblique aerial photograph taken during the Royal Commission's programme of archaeological aerial reconnaissance by Toby Driver on 3rd June 2015.
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    Royal Commission on the Ancient and
    Historical Monuments of Wales
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