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678157 Gwynedd Archaeological Trust Projects Archive Archaeological Excavation report on Powerline Refurbishment at Bwlch y Ddeufan and Llannerch Fedw. Written by Carol Ryan Young of Gwynedd Archaeological Trust, October 2019. Project No. G2626. Report No. 1510. Historic Environment Record Event Primary Reference Number 45464. testun;ffotograff;graffig;cartograffig