Papers, 1844-1941, of the Williams family of Acre House, Acrefair, mainly comprising letters, including family correspondence and letters received from relatives in Glamorgan, from the Pugh family, and from relatives in the USA, [late 19th cent.]-[early 20th cent.]; letters to the Rev. Ebenezer John Williams, mostly relating to his duties as minister and the chapel and water works in Llanwddyn, 1882-1889; and letters to John Williams, [late 19th cent.], mostly relating to the iron industry. The archive also includes diaries of John Williams, 1844-1897; notebooks, accounts and other documents, 1856-1893, relating to the ironworks in Ruabon and South Wales; diaries and notebooks of the Rev. Ebenezer John Williams, 1869-1935 (including chapel committee notes, accounts, Sunday School registers, and sermon notes); diaries and notebooks of Rev. John Pugh, 1849-1890, (including one containing his autobiography); papers relating to Liberal Party election campaigns in Montgomeryshire and Denbighshire, [late 19th cent.]; deeds, 1842-1921, mostly relating to property in Dowlais; papers relating to schools, [late 19th cent.]-[early 20th cent.], including school notebooks, prospectuses of schools including Holt Academy, and papers relating to the founding of British schools in the Cefn Mawr district and elsewhere.

This section comprises correspondence, papers and records accumulated by O. M. Edwards as Chief Inspector of Schools in Wales under the new Welsh Department of the Board of Education from 1907. It consists of correspondence files; notebooks recording details of Edwards's visits to Welsh schools; a register of visits, 1909-1910; and two reports on Welsh education, 1892 and 1911, prepared by O. M. Edwards.

Notes and press cuttings relating to Board and Voluntary schools in England and Wales, the disestablishment of the church in Wales, and the history of Brecknockshire, including transcripts of documents relating to Builth.

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.