A commonplace book kept by Ioan Pedr containing a large number of notes on a variety of subjects; 'englynion', hymns and other poetry; folk- and nursery-rhymes; tales, games and anecdotes relating mainly to Bala and district; a Welsh translation of Shakespeare: Hamlet, Act I, Scene I; notes on sheep ear-marks, with examples and diagrams; lists of poems by Thomas Edwards ('Twm o'r Nant'); biographical, bibliographical and philological notes, including lists of dialect words; inscriptions and epitaphs at Llanycil church; a copy of a letter written 21 September 1828 from Delaware, U.S.A., by John Edwards ('Eos Glan Twrch') to his parents at Tynyfedw, Cynllwyd, Merioneth; etc.

The series comprises personal letters written from Oxford, Cardiff, London and other places discussing his career and professional activities, as well as illuminating the complex relationship, full of tensions and problems, between husband and wife. The letters also refer to many members of the family and to a host of prominent contemporary figures, amongst them Sir Edward Anwyl, Thomas Edward Ellis, Sir John Morris-Jones, Sir John Rhys and Daniel Lleufer Thomas. There are many references to Llanuwchllyn and Penllyn more generally and to O. M. Edwards's wide-ranging services to Wales, including his editorship of a number of journals and his work as Chief Inspector of Schools in Wales after 1907.

Notes, press cuttings, posters, programmes of literary and other meetings, circulars and other papers relating to Bala and the Penllyn district of Merioneth, together with miscellaneous prose and verse, including translations from Greek and Latin authors.