- H5/44-60.
- Ffeil
- 1966, January 27-1975, March 7.
Rhan oHarri Webb Papers,
Seventeen letters to Harri Webb from various members of the society including Gareth Miles, Dafydd Iwan, Rhodri Morgan and Cynog Dafis regarding campaigns, the writing of the English language translation of the manifesto and the provision of bail by Harri Webb for offences committed on behalf of the society. Welsh.