Ffeiliau amrywiol, 1929-2002, y mwyafrif yn ymwneud ag ymgyrchoedd gwleidyddol a hanesyddol y bu Gwynfor Evans yn gysylltiedig â hwy; papurau personol amrywiol, 1938-2001, gan gynnwys torion o'r wasg, papurau teuluol, papurau'n ymdrin â theithiau tramor Dr Evans, papurau seneddol, nodiadau areithiau a chardiau cyfrach; a miscellanea, [c. 1930]-1998, yn eu plith datganiadau i'r wasg, taflenni a phamfledi amrywiol a lluniau./Various files, 1929-2002, most relating to the numerous political and historical campaigns in which Gwynfor Evans was involved; miscellaneous personal papers, 1938-2001, including press cuttings, family papers, papers relating to Dr Evans's trips abroad, parliamentary papers, speech notes and greetings cards; and miscellanea, [c. 1930]-1998, including press releases, miscellaneous leaflets and pamphlets, and photographs.