Mae'r casgliad yn cynnwys ffeiliau gohebiaeth a chofnodion cyfarfodydd. Ymysg rhai o'r ffeiliau ceir amlinelliad o'u cynnwys a baratowyd gan y Parch. Huw Wynne Griffith ynghyd â manylion am ddigwyddiadau arwyddocaol. Mae'r ffeiliau yn ymwneud â chyfamodi, 1963-1991; pwyllgor y pedwar enwad, 1954-1970; Cymdeithas Ecwmenaidd Cymru, 1947-1978; Cyngor Eglwysi Rhyddion, 1956-1990 (yn cynnwys cofnodion,1956-1989, a phapurau'n ymwneud â Phwyllgor Ffydd a Threfn, 1961-1970, Pwyllgor Materion Cenedlaethol a Rhyngwladol, 1971-1989, a phapurau amrywiol,1966-1989); grŵp Aberystwyth o Gyngor Eglwysi Cymru, 1962-1990 (yn cynnwys cofnodion,1962-1990, ffoaduriaid,1955-1986, a phapurau amrywiol,1962-1990); Cytun, 1990-1992; Cyngor Eglwysi Prydain, 1964-1981; a phapurau amrywiol,1958-1991. = The collection consists of files of correspondence and committee minutes. Within some of the files is an outline of their contents prepared by Rev. Huw Wynne Griffith together with details of significant events. The files relate to covenanting, 1963-1991; the four denominations committee, 1954-1970; the Welsh Ecunemical Society, 1947-1978; the Council of Welsh Churches, 1956-1990 (comprising minutes, 1956-1989, and papers relating to the Faith and Organisation Committee, 1961-1970, the Committee for National and International Matters, 1971-1989, and miscellaneous papers, 1966-1989); the Aberystwyth group of the Council of Welsh Churches, 1962-1990 (including minutes, 1962-1990, refugees, 1955-1986, and miscellaneous papers, 1962-1990); Cytun, 1990-1992; the Council of British Churches, 1964-1981; and miscellaneous papers, 1958-1991.
Y Parch. Huw Wynne Griffith.