Some sixty letters and cards, 1927-39, to Geraint Dyfnallt Owen, mostly from the Abbé Jean-Marie (Yann-Vari) Perrot (1877-1943), Breton cultural and religious leader, but also including letters, 1933-9, from his secretary Henri Caouissin. As well as containing personal news the letters include references to nationalism in Brittany and to prominent political activists.

A journal of a visit to Brittany, 10 July-8 August 1933, by Geraint Dyfnallt Owen and his parents, containing references to Breton political and cultural activities including comments on the nationalist movement and accounts of meetings with prominent activists.