Papurau William Andreas Jones, [1935]-[1988], gohebydd y wasg i Bwyllgor Etholaeth Arfon o Blaid Cymru a llythyrwr cyson i'r wasg, gan gynnwys llythyrau oddi wrth Anthony Wedgwood Benn (2), Neil Kinnock, John Morris a Dafydd Iwan (2), torion o'r wasg yn ymwneud â Phlaid Cymru a'r Bedwaredd Sianel, a'i atgofion cynnar.

Taflen ganfasio Waldo Williams pan safodd fel ymgeisydd Plaid Cymru dros Sir Benfro yn Etholiad Cyffredinol 1959.

Ieuan Wyn Jones political papers, 1964-2015, mostly from the period when he was Member of Parliament and Member of the National Assembly for Wales for Ynys Mon, including correspondence on various topics, constituency papers, papers relating to Plaid Cymru, the leadership of Plaid Cymru and the One Wales coalition government.