Papurau Owen Parry, Llanegryn, hynafiaethydd, yn cynnwys grŵp sylweddol o farddoniaeth a phapurau William John Roberts, 'Gwilym Cowlyd', 1827-1904; nodiadau ar y diwydiant wlân,1696-1780; llawysgrif o bregethau ac emynau gan Thomas Phillips, Neuadd-lwyd,1809; papurau'n ymwneud ag Arwest Glan Geirionydd, 1890-1896, ac Eisteddfodau, 1878-1890; cofnodion dau ddosbarth efrydiau allanol dan arweiniad y rhoddwr,1929-30; arolygon ac adroddiadau'n ymwneud â Thywyn, Ffestiniog, sir Feirionnydd a Dolgellau, 1940-1957; chwe dogfen a oedd gynt yn eiddo i gyfreithiwr o Amlwch, 1793-1914 = Papers of Owen Parry, Llanegryn, antiquary, including a significant group of poetry and papers of William John Roberts, 'Gwilym Cowlyd', 1827-1904; notes on the woollen industry, 1696-1780; a manuscript of sermons and hymns by Thomas Phillips, Neuadd-lwyd, 1809; papers relating to Arwest Glan Geirionydd, 1890-1896, and to Eisteddfodau, 1878-1890; minutes of two extra-mural classes conducted by the donor, 1929-30; surveys and reports relating to Towyn, Ffestiniog, Meirionethshire and Dolgellau, 1940-1957; six documents previously belonging to a solicitor from Amlwch, 1793-1914.