Papers relating to the beginnings of Tŷ Toronto, 1966-1984; poems and letters relating to the disaster, 1966-1973; minutes, letters and papers of various groups which were founded as a result of the disaster, namely the Uniting Group, 1965-1969, Committee for Dismantling the Heaps, 1967-1970, Aberfan and Merthyr Vale District Group, 1969-1984, Aberfan and Merthyr Vale Youth Centre, 1968-1972; also included are the papers of Headway press, 1967-1995; papers of the Merthyr Council of Churches and the Aberfan and Merthyr Vale Council of Churches, 1965-1986; and other papers relating to conferences and other significant events, 1961-1985.