Sôn am yr ymgiprys rhwng William Thomas a William ap Madog yngl?n â'r Geufron. Cyfeiria William Salesbury at ryw lysieyn a oedd i'w cael yno.
Llythyr oddi wrth W. Gilbert Williams, Tal y Bont, Rhostryfan, Caernarfon at Ifor Williams
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- ReferenceGB 222 IW/1534
- Dates of Creation24/1/1947