Llythyrau cyffredinol, 1939-2002, wedi eu cyfeirio at Gwynfor Evans, ynghyd â ffeiliau o lythyrau, 1940-1996, oddi wrth bedwar-ar-ddeg o unigolion blaenllaw a fu'n gohebu'n gyson â Gwynfor Evans; ffeiliau ar bynciau penodol, 1968-1983, ynghyd â ffeiliau cyffredinol ar bynciau amrywiol, 1971-1979; a ffeiliau amrywiol, 1929-1981; papurau personol amrywiol, 1938-2001, a phapurau amrywiol, [c. 1930-1998]./General letters, 1939-2002, addressed to Gwynfor Evans, together with files of letters, 1940-1996, from fourteen prominent individuals who corresponded regularly with Gwynfor Evans; files on specific subjects, 1968-1983, together with general files on miscellaneous subjects, 1971-1979; and various files, 1929-1981, miscellaneous personal papers, 1938-2001, and miscellanea, [c. 1930-1998].

Deeds and documents relating to Glyneiddan, Nantgaredig, and other premises in Carmarthenshire, 1785-1955, and papers of Henry Jones-Davies, relating to local government in Carmarthenshire, 1895-1950; and to agriculture, 1910-1945, especially to agricultural co-operatives in Wales.