Ysgol Tryfan, Lôn Powys, Bangor, Gwynedd, LL57 2TU Arolygiad Dan Adran 9 O Ddeddf Addysg (Ysgolion) 1992 : Rhif Ysgol: 573/4037 : Dyddiad Yr Arolygiad: Chwefror 26 - Mawrth 1, 1996

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