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    Elan Aqueduct: Air Valve Chamber, Caethon Syphon

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    Archive NumberTitleLevelDescriptionMediumImagesArchive Number2025-01-29_5555TitleAP2024_503LevelGroupDescriptionAerial photographic surveys conducted during the Royal Commission’s programme of archaeological aerial reconnaissance by Toby Drive covering a large number of sites around mid and west Wales, 9 July 2018Medium396 tif files.ImagesnArchive NumberAP2024_503_240TitleAP2024_503_240LevelItemDescriptionRCAHMW colour oblique aerial photograph of Elan aquaduct parchmarks at Clas taken on 9 July 2018 by Toby DriverMedium1.tifImagesy