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Amgueddfa Cymru – Museum Wales
Copi ffoto, anghyflawn, o ddarlith gan Hywel Jefferies (g. tua 1884-5) 'A Ydyw Pethau yn Gwella Neu yn dirywio. A Rhai Adgofion Am Y Colbren' [sir Frycheiniog]. Dim dyddiad.
