Papurau Aelwyd yr Urdd, Aberystwyth, 1928-1991: cofnodion y cyfarfod cyffredinol blynyddol, y pwyllgor cyffredinol a phwyllgorau eraill, 1928-1990; cofnodion, gohebiaeth a phapurau eraill,1968-1991; a chyfrol o dorion o'r wasg a rhaglenni, 1954-1964 = Papers of Aelwyd yr Urdd, Aberystwyth, 1928-1991: minutes of the annual general meeting, general committee and other committees, 1928-1989; membership books of officials and committee members, 1933-1990; minutes, correspondence and other papers, 1968-1991; and volume of newspaper cuttings and programmes, 1954-1964.