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Amgueddfa Cymru – Museum Wales
'Astudiaeth o Gymraeg llafar ardal Ceinewydd: ei seineg gydag ymchwiliadau gwyddonol, ei seinyddiaeth a'i ffurfiant gyda geirfa lawn, a chyfeiriad at ei semanteg' - traethawd Ph.D. (Cymru) 1934, gan J.J. Glanmor Davies.
