Extensive material relating to Welsh bibliography accumulated by, and mainly in the hand of, D. Silvan Evans. It includes a volume entitled 'Bibliotheca Cambrensis. Llyfrofyddiaeth Cymru' ('A[u]ctore Dan. Silvano Evans, Cereticense') (pasted on to the inside lower cover is a holograph letter from the Reverend David Williams, Llanedy Rectory, 1868, giving the entry of baptism of John, son of John Walter, cleric and lexicographer, on 22 August 1721); a home-made notebook entitled 'Llyvryddiaeth Gymreig' (pasted on to the inside lower cover is a note in the hand of Benjamin Williams, ('Gwynionydd')); another home-made notebook entitled 'Emynau detholedig at Wasanaeth yr Eglwys. Rhag. 29, 1862', being a bibliography of Welsh hymnals and relevant source material; copious unbound leaves containing book titles (one of the titles is written on the dorse of a letter from M. A. Lewis, Tredegar Post Office, 1868, requesting the return of the writer's copy of 'Dr. J. D. Rees's Old Grammar'); and letters from John Peter ('Ioan Pedr'), Bala to [Henri] Gaidoz, 1870 (publications not contained in Rowland's work [Llyfryddiaeth y Cymry]), to D. Silvan Evans from W[illia]m Price, Llanffwyst, Abergavenny, 1869 (an addition to Llyfryddiaeth y Cymry), [Robert John Pryse] 'Gweirydd ap Rhys', Bangor, [18]78 (the title of Llyfer Plygain, 1618, transcribed by the writer from a volume examined at the Pengwern [Mostyn] sale in 1874), W[illiam] Rowlands ('Gwilym Lleyn'), Machynlleth, 1862-4 (4) (additions and corrections to [Llyfryddiaeth y Cymru], with references to Evan Evans ('Ieuan Brydydd Hir'), to [Jane] Davies, Penmaen, to W. F. Skene, etc., a request by a local printer to be allowed to print the recipient's edition of the works of [Walter Davies] Gwallter Mechain', the writer's removal from the manse to another house in Machynlleth and subsequently to Oswestry, the reported cataloguing of 'Llyfrfa Coleg Dewi' [the library of St. David's College, Lampeter], the illness and voyage to Australia of the writer's son), and from W[illiam] Spurrell, Carmarthen to [William] Rowlands ('Gwilym Lleyn') at Brynmawr, 1851-2 (2) (the writer's copy of Sion Dafydd Rhys's Welsh Grammar, biography of John Daniel, printer of Carmarthen). Some of the unbound titles are in the hand of Richard Williams (1835-1906), Celynog, Newtown and there is some later and additional material in the hand of J. H. Davies.