Manuscript collections containing original and transcribed poetry and prose, 1543-[20th century]; religious works, 1611-1914; biographies, chronicles, archaeological and historical notes, works on travel, folklore, recipes, grammars, vocabularies and philological notes, 1673-1900; rent-rolls, parish registers, tithe account books, bidding books, minute books and registers of various societies, 1608-1863; pedigrees and genealogical notes, [17th century]-1871, commonplace books, [18th century]-1904, volumes of press-cuttings; manuscripts in the hand of J. H. Davies, including transcripts of and indexes to Welsh poetry, bibliographical notes, literary and legal extracts, pedigrees, biographical data and notes on place-names, 1891-1923; autograph letters from prominent Welsh literary figures, 1674-1921; autograph manuscripts of John Jones, Gellilyfdy, Dafydd Ellis of Criccieth, Eben Fardd (including diaries, 1836-1859), Peter Williams, D. Silvan Evans, Thomas Richards and Myrddin Fardd.