The series consists of notes, [c. 1877]-1919, relating to the history of the Old Meeting House (Hen Dŷ Cwrdd), Aberdare; together with reports, 1908, from Unitarian churches relating to attendances; press cuttings, 1877, concerning the Llwynrhydowen eviction in 1876 and notes on ministers of Merthyr Tydfil and Cefncoedycymer.