Collectively called the Crosswood Manuscripts after their Montgomeryshire home, this collection consists of three groups of manuscripts known as the Walter Davies (Gwallter Mechain) Manuscripts, the John Jenkins (Ifor Ceri) Manuscripts, and the Frances Althea Trevor Manuscripts.
Transcripts by Walter Davies of part of a text of Brut y Brenhinoedd, of cywyddau from Llyfr Ystrad Alun (now MS. 7191), and of portions of William Boutcher: A Treatise on Forest Trees ... (Edinburgh, 1775).
Welsh and English versions of a history of Cadwgan, prince of Powys, and the Welsh chieftains, compiled by John Evans (Maelor), 1841, and dedicated to John Vaughan, Penmaen Dyfi, Merioneth.
'Englynion' by Walter Davies and others; adjudications by him on 'englynion coffa' upon the death of Griffith Williams (Gutyn Peris) and David Owen (Dewi Wyn o Eifion) and on other poetic compositions; and extracts by Walter Davies from William Buckland: Reliquiae Diluvianae ... (London, 1824).
Abstracts from Edward Hyde (1st earl of Clarendon) : A History of the Rebellion ..., Gilbert Brunet : History of His Own Time, and other printed works.
Transcripts of letters from John Morgan (Matchin), Lewis Morris, and William Wynn, with notes by Walter Davies; a transcript of Account of MSS. in Wales, written by the learned and ingenious Lewis Morris, as it is supposed about the year 1745 (cf. Panton MS. 29, i.e., N.L.W. MS. 1998); transcripts, by Walter Davies, of Welsh poems allan o Lvyr Med Davis o Vron Wion ym Meirion-a sgrivwyd 1738; etc.
Extracts, in the hand of Walter Davies, from Cyfrinach Beirdd Ynys Prydain, possibly made from the original draft written by Edward Williams (Iolo Morganwg); and notes by Walter Davies entitled 'Sylwadau ar ba Gyhydeddau a Mesurau y canent y prif-feirdd', and based on a study of the earlier Welsh poetry printed in the first volume of The Myvyrian Archaiology of Wales.
Transcripts by John Jenkins and others of poetry in free metre by John Evans (Llanfihangel Ystrad), John Howell, Jonathan Hughes, John Edwards (Clochydd Manafon), R. Jones, David Ellis, and Peter Jones (Pedr Fardd).
Poems, essays, letters, and miscellanea by Walter Davies used by D. Silvan Evans when he was compiling Gwaith ... Walter ... Davies ... (Carmarthen and London, 1868).
Transcripts by Walter Davies of elegiac englynion by various authors on the death of David Owen (Dewi Wyn of Eifion), englynion eulogising Edward Mostyn Lloyd Mostyn, pedigrees and genealogical notes, replies to queries sent by Lady Charlotte Guest, letters, etc.