A history of Wales transcribed from George Owen's treatise of lordships marcher in Wales; copies of a statement made March 10, 1685/6, at New York by Morgan Jones, 'the son of John Jones of Basleg near Newport in Monmouthshire', attesting that he had conversed with American Indians in the Welsh language (see The Gentleman's Magazine, 1740), of a letter, August 14, 1734, on a similar subject sent by Charles Lloyd, Dolobran, Montgomeryshire, to a cousin, and of 'Dr. [Robert] Plott's Account [to the Royal Society] of an Antient Discovery of America from Wales'; a list, in the hand of John Lloyd, Caerwys, of 'The names of the Principal men that kept Hardelech castle against Edwd the 4th;' lists of the sheriffs of Flintshire, Denbighshire, Montgomeryshire, and Merioneth; transcripts of epitaphs in Mold church; and notes taken from Thomas Carte : A General History of England (London, 1747-1755).

Extracts, mainly by Stephens, from printed sources, such as The Myvyrian Archaiology of Wales and works by John David Rhys, Humphrey Lhuyd and Edward Jones ('Bardd y Brenin'); transcripts from Welsh pedigrees in British Museum Harleian MS 3859; and material relating to the alleged existence of the Welsh or White Indians - 'Y Madogwys'.

Letters, 1859-1868, to Stephens mainly relating to the supposed discovery of America by Madog ab Owain Gwynedd and the possibility of the existence of a tribe of Welsh Indians ('y Madogwys'); miscellaneous notes; and press cuttings.

A composite manuscript of 'Miscellanies' largely in the hand of Evan Evans ('Ieuan Fardd', 1731-88), containing 'Ecloga. Argumentum. Frederici Serenissimi Wallice Principis Mors. Personae. Thyrsis Pastor et Corydon Bubulcus' by Evan Evans 'e Coll. Mert[on]. A.D. 1752 Aetatis 21'; 'An Extract from the Critical review for April 1773' relating to 'The Love of our Country a poem &c'; 'A copy of George Crochan's letter to Governor Dinwiddie concerning the Welsh Indians', written from Winchester, 24 August 1753, together with Dr Worthington's remarks thereon, 1766; 'The three most famous Musicians in King James 1st's time' [Lewis Penmon, Heilin, and Dic Bibydd] ('Ex MS Johannis Salusbtry d' Erb[istock]'); 'The Saxon Alphabet', 'The antient British Alphabet', and 'Alphabetum e nummis antiquis desumptum'; 'Notes on Giraldus Cambrensis', 'D'ni Johannis Davidis Rhesi de Gruffudd Robert Grammatices Cambrobrittanicae Mediolani impressi A.D. 1567', 'D. Rogeri Smyth Lanelwyensis testimonium de eodem', and other extracts from printed sources; 'A Description of Glyn Aeron', with a 'free' English translation; 'Priodas Gerdd or an Epithalamium address to the Revd. Mr. Hugh Lewis of East Grinstead' ('Y Brawd Du o Nannau ai Cant 1772 Aet. 65'); extracts ('Excerpta') from contemporary medical and other sources; a fragment (Abba - Achub) of a Biblical concordance entitled ''Cydfod yr Ysgrythyrau Sanctaidd' ('Llaw Ifan Wiliam hon yma. Yr oedd Rivington ar fedr copiaw'r holl lyfr, rhag dryllio'r eiddox wrth y wasg') (see NLW MS 254); a transcript of a letter from John Griffith, Oswestry, to his father, 1770, enclosing 'another piece in Heroics' (published in Y Brython, 1859, pp. 242-4); transcripts from newspapers reporting the installation of Lord [Frederick] North [2nd earl of Guilford] as chancellor of the University of Oxford, 1772; corrigenda by the author to Evan Evans: 'Haec veterum Bardorum Britannicorum specimina ...' [Some Specimens of the Poetry of the Antient Welsh Bards. Translated into English... (London, 1764)]; a list of sheriffs of Cardiganshire, 1540-1739; 'Bugeilgerdd, sef Ymddiddan rhwng dau Fugail, Gruffudd a Meurig...' by E[dward] Richards, Ystradmeurig, 1766; a transcript of a letter of Evan Evans, Gynhawdref, 20 June 1768 (the writer's translation of Mr Richards' Pastoral); English verses on the subject of the Carmarthen election of 1768, and 'The Character of a Rustic translated from the Greek Original by Theophrastus', by Jno. Beynon, 'Student at the Academy AD 1768 who is now a dissenting Minister in England ...'; etc. Inset is a holograph 'Cywydd Marwnad Mr. William Morris o Gaer Gybi ym Môn ...' by Evan Evans ('offeiriad Llanfairtalhaiarn. Ionawr 1764').