Ymddiriedolaeth Archaeolegol Gwynedd / Gwynedd Archaeological Trust

Cymdeithas Hanes Sir Gaernarfon / Caernarvonshire Historical Society

Y LLyfrgell Genedlaethol / National Library of Wales
Cymdeithas Hanes Teuluoedd Gwynedd / Gwynedd Family History Society
Cymdeithas Hanes teuluoedd undebol Cymru / Family History Societies of Wales
Amgueddfeudd ac orielau Cenedlaethol Cymru / National Museums and Galleries of Wales
Yr Eglwys yng Nghymru / The Church in Wales
Cyngor Cefn Gwlad Cymru / Countryside Counil of Wales
The Public Record Office
The Royal Commission on Historical Manuscripts
The British Library Manuscript Collections

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