Most of the letters, 1892-1916, are devoted to the writer's researches, writings and editing of Wales, Y Llenor, Heddyw and Cymru for which he solicits contributions from the pen of J. H. Davies. Several letters refer to the death of Thomas Edward Ellis in April 1899, the preparation of his biography and the erection of a memorial statue at Bala. Others relate to J. H. Davies's application for the position of Registrar of the University College of Wales, Aberystwyth, and some to Edwards's duties as Chief Inspector of Schools in Wales.

Miscellaneous papers, including 'A New Plan for me at school Llansilin 1834' signed 'Wm Roberts', 'Ysgolion Cymru a Chyfroddion y Llywodraeth', 'Ansefydlogrwydd serch tuag at weinidogion yr Efengyl', a copy of a printed circular - The Advantages of Government Inspection of Schools - by W. Roberts, Agent for the British [and] Foreign School Society for South Wales, Blaina, April 17, 1855, 'Terms of Union To be subscribed by parties desirous of uniting their schools with the National Society', 'The spread of Baptist principles in Wales', etc.