Deunydd yn ymwneud â'r flodeugerdd O'r Iawn Ryw (1991), a olygwyd gan Menna Elfyn, gan gynnwys adolygiadau ac erthyglau.

Deunydd yn ymwneud â'r flodeugerdd Hel Dail Gwyrdd (1985), gan gynnwys adolygiadau o'r casgliad.

Deunydd yn ymwneud â'r flodeugerdd ddwyieithog Eucalyptus (1995), gan gynnwys adolygiadau, datganiadau i'r wasg, llythyrau at Menna Elfyn oddi wrth Tony Conran a Joseph Clancy, dau o gyfieithwyr y cerddi, a chyfieithiad o un o'r cerddi i'r Galiseg; ynghyd â deunydd yn ymwneud â chyfieithiad o Eucalyptus i Fietnameg, sy'n cynnwys gan fwyaf lythyrau a chardiau at Menna Elfyn oddi wrth ei chyswllt llenyddol yn Hanoi, Trinh Thi Dieu.

Deunydd yn ymwneud â'r flodeugerdd Aderyn Bach Mewn Llaw (1990), gan gynnwys adolygiadau, gohebiaeth, erthygl a chyfrol o farddoniaeth sy'n cynnwys cyfieithiadau o un o'r cerddi gwreiddiol i Iseldireg a Ffriseg Orllewinol.

Deunydd yn ymwneud â Ffŵl yn y Dŵr (1999), cyfrol o gerddi ar gyfer pobl ifanc a olygwyd gan Menna Elfyn, gan gynnwys adolygiad.

Deunydd yn ymwneud â'r flodeugerdd ddwyieithog Cell Angel (1996), gan gynnwys adolygiadau, datganiadau i'r wasg, erthyglau, cyfieithiad o'r gyfrol i'r Eidaleg, a gohebiaeth berthnasol, gan gynnwys llythyrau at Menna Elfyn oddi wrth Tony Conran a Joseph Clancy, dau o gyfieithwyr y cerddi i'r Saesneg.

Cerddi gan Menna Elfyn a gynhwysir yn ei chyfrolau cyhoeddiedig ond nad oeddent wedi'u cyplysu o fewn y casgliad ag unrhyw gyfrol(au) penodol.

Barddoniaeth amrywiol feirdd ar wahân i Menna Elfyn, gan gynnwys Nigel Jenkins, R. S. Thomas, Ted Hughes, Peter Meilleur, Iwan Llwyd, Joseph Clancy, Raymond Garlick a Gillian Clarke.

A volume containing autograph poetry by Catherine Jane Prichard (Buddug), daughter of Gweirydd ap Rhys and author of Caniadau Buddug (Caernarfon, 1911); and transcripts of her poems by her husband, Owen Prichard (Cybi Velyn).

An exercise book containing poems in the autograph of [Sir] Owen M. Edwards - 'Meinwen Manon'; 'Telyneg'; 'Fy Mun'; 'Orfhws'; 'Dol y Dolefain'; 'Y Nos'; 'Saith Oes Dyn (Cyf. o Shakespeare)'; a metrical sketch entitled 'Maes Garmon'; and 'In quest of Peace'.

Some one hundred and forty letters, 1948-1997, in English and Welsh, to John Elwyn from various correspondents (surnames S-W), both personal and work related.
The correspondents include Christopher Sandford, 1953 (ff. 12-13), Meic Stephens, 12 December 1995 (f. 22), Winifred Coombe-Tennant, 19 February 1948 (f. 33), Dewi-Prys Thomas, 1977-1978 (ff. 36-37), David Tinker, 1967 (ff. 44-45), John Ward, 1967-1992 (ff. 75-78 verso), George Weber of Edmonton, Alberta, 1987-1994 (ff. 81-97 verso), Sir Huw Wheldon, 1961, [?late 1970s] (ff. 116-118), Phillip Whitfield, 1991-1996 (ff. 119-146 verso), the Rev. G[wilym] O[wen] Williams, 20 February 1952 (f. 158), Kyffin Williams, [1960s]-1995 (ff. 161-167), Stan Williams, [?early 1990s], (f. 171), and the Royal Cambrian Academy of Art, 1965-1967 (ff. 148-153). Also included are draft letters from John Elwyn (ff. 53, 58 verso-59 verso, 63 verso, 100) and drafts of two poems by Phillip Whitfield, 1991-1992 (ff. 124, 127, 129, 131, 134, 138, 141), with a translation into Welsh of one of them [?by John Elwyn], [?1992] (f. 147).

Typewritten copies of sonnets and other poems composed by T. E. Nicholas in Swansea and Brixton prisons. There is also a typewritten preface and detailed introduction recounting the poet's arrest and imprisonment.

Over a hundred and fifty letters, 1961-88 in English, Welsh and French, from various correspondents (surnames Jones-W). The letters, some of which include fair copies of published poems, are chiefly concerned with contemporary writing in Wales in both English and Welsh and with the recipient's work as editor of a number of volumes in this field. The correspondents include Glyn Jones (36, and three poems) 1967-86, Gwyn Jones (6) 1967-87, Saunders Lewis (1) 1974, Roland Mathias (17) 1961-86, Leslie Norris (32, and one poem) 1967-86, Eigra Lewis Roberts (2) 1970-3, R. S. Thomas (1) 1975, John Tripp (8) 1968-78, Harri Webb (14) 1967-79, and Kyffin Williams (8) 1970-1.

Deunydd yn ymwneud â Stafelloedd Aros (1978), sef ail flodeugerdd Menna Elfyn, gan gynnwys drafftiau gwreiddiol o'r cerddi (a luniwyd tra'n yr ysbyty) a chyfieithiadau o rai o'r cerddi gorffenedig i'r Saesneg.

Autograph letters, mainly to 'Gwilym Cowlyd', from [?Avaon] Eryri (1872); 'Cynwal' (1879); 'Clwydfardd' (1875); 'Cyfanwy' (1882); 'Cadvan' (1862); 'Caerwyson' (1886); C. W. Jones (Secretary of the Cymmrodorion Society) (1883); 'Cymrygarwr' (1878); 'Crych Elen', Cyffdy; autograph letters to 'Gwilym Cowlyd' from 'Gwilym Dyfi' (1884); John M. Davies (1898); 'Druisim' (1884); 'Telynor y Gogledd' (1876); Elias Davies ('Ehedydd Arfon') (1889); William Davies (1862); I. I. Davies (1889); J. H. Davies (1904); 'Dewi Glan Ffrydlas' (1881); E. Ellis (1862); R. C. Evans, Dolgelley (1903); 'Elfyn' (1893); 'Eos Môn' (1876); 'Eos y Berth' (1880); 'Elldeyrn' (1876); Vincent Evans (1898); D. Silvan Evans (1881, 1884, 1882); 'Eos Llechid' (1862); David Francis, Gwrtherid (1888); 'Gwilym Ebrill' (1881); 'Glan Tecwyn' (1892); 'Granwllefab' (1879); 'Gwenllian' (1901); 'Gutyn Ebrill' (1878); 'Hugh Fylchi' (1869); John Hughes (1875); Ceiriog Hughes (1875); John Hughes, Tanygrisiau; 'Iolo Môn' (1877); 'Illtyd' (1892); William Jones ('Gwilym Meirion') (1897); R. Jones ('Trebor Aled') (1899); J. Jones (Dwdan) (1890); David Jones ('Dewi Padarn') (1863); 'Ieuan Eifion' (1863); T. James (1878); Richard James; R. H. Hugh Jones; Spinther James (1887); O. Jones, Rhuddlan (1893); Owen Jones, Llansantffraid (1896); Cynwal Jones, Conwy (1881); J. Jones ('Ogwenydd') (1881); David Jones ('Dafydd Morganwg') (1879); Owen Jones ('Telyn Seiriol') (1880); W. M. Jones, Bettws y Coed (1889); W. H. Jones ('Gwilym Dâr') (1878); John Jones ('Talhaiarn') (1869, 1863, 1868); E. Doged Jones, Lerpwl; Tudno Jones; Idris Fychan (1884); Iolo Trefaldwyn (1877); 'Llallawg' (1878); 'Llew Llwyfo' (1891); 'Llinos Moelwyn' (1899); 'Ap Myrddin' (1890); an autograph letter to R[ichar]d Hughes from Osborne Morgan (1878); autograph letters to 'Gwilym Cowlyd' from 'Machraeth Môn' (1896); 'Morien' (1894); Lord Mostyn (1898); H[uw] Machno (1875); W. Morgan ('Penfro') (1883); Alfred Moffat (1902); 'Mynyddog' (1879); 'Owain Alaw' (1873); Edw[ard] H. Owen, Tycoch; 'Pencerdd Eifion'; Robert Parry, Ruthin (1862); D. E. Phillips, Pontypridd (1893); 'Penfro' (1889); Tho[ma]s Powel, Penarth (1887, 1894); John Roberts, Ruthin; Robyn Wyn (1878); T. Herbert Roberts, Abergele (1900); Llywarch Reynolds (1884); 'Rhuddfryn' (1862); Ellis Roberts, Corwen (1878); T. F. Roberts, Aberystwyth (1895); John Rhys, Oxford (1895); John Roberts (Welsh Harper) (1878); Robin Delynor (1884); Evan Rees ('Dyfed') (1881, 1885); an autograph letter to Lord Mostyn from 'Gwilym Cowlyd' (1878); autograph letters to 'Gwilym Cowlyd' from 'Taliesin Hiraethog' (1884); 'Trebor Aled' (1899); Edw[ard] Thomas, Blaenau Ffestiniog; R. W. Tudor, Tanygrisiau (1894); 'Teibal Lleifiad' (1895); 'Taliesin o Eifion' (1876); Egerton Phillimore (1882); Cornwallis West (1886); R. Môn Williams; John Williams ('Eos Môn'); and miscellaneous papers containing poetry and adjudications.

Deunydd yn ymwneud â Glas-Nos: Cerddi Dros Heddwch/Poems for Peace (1987), cyfrol o gerddi a gyd-olygwyd gan Menna Elfyn a Nigel Jenkins, gan gynnwys datganiad ar ffurf llythyr agored ac adolygiadau.

Deunydd yn ymwneud â'r flodeugerdd Mynd Lawr i'r Nefoedd (1986), gan gynnwys llythyrau at Menna Elfyn oddi wrth yr Athro John Rowlands ac adolygiadau o'r gyfrol.

A notebook containing transcripts by D. Myrddin Lloyd of over eighty poems by Robert Williams Parry, mostly composed between 1924 and 1948, many of which later appeared in Cerddi'r Gaeaf (Dinbych, 1952). Details of date and place of first publication are appended to most of the poems.

Tri llythyr, 1886, yn Saesneg, at Vincent Evans oddi wrth T. E. Ellis, O. M. Edwards a John Ceiriog Hughes ('Ceiriog'); tair llythyr ar ddeg (un yn Saesneg) ac un cerdyn post, 1903-1918, at J. Owain Evans oddi wrth Eliseus Williams ('Eifion Wyn'), ynghyd â thoriad o'r Darian a gohebiaeth, yn Saesneg a Chymraeg, [1917], oddi wrth y Comisiwn Yswiriant Iechyd Cenedlaethol parthed Thomas Evans, tad Robert Evans ('Cybi'); deuddeg llythyr, yng Nghymraeg a Saesneg, 1912-1914, at J. Owain Evans oddi wrth Robert Roberts ('Isallt'), ynghyd â thoriad o'r Rhedegydd, 15 Chwefror 1913, sy'n dwyn llythyr oddi wrth 'Isallt', toriad parthed 'Isallt' o'r News Chronicle, d.d., a barddoniaeth Cymraeg a Saesneg, 1911-1913, yn llaw 'Isallt' = Three letters, 1886, in English, to Vincent Evans from T. E. Ellis, O. M. Edwards and John Ceiriog Hughes ('Ceiriog'); thirteen letters (one in English), and one postcard, 1903-1918, to J. Owain Evans from Eliseus Williams ('Eifion Wyn'), together with a cutting from Y Darian and correspondence, in English and Welsh, [1917], from the National Health Insurance Commission in relation to Thomas Evans, father of Robert Evans ('Cybi'); twelve letters, in Welsh and English, 1912-1914, to J. Owain Evans from Robert Roberts ('Isallt'), together with a cutting from Y Rhedegydd, 15 February 1913, which contains a letter from 'Isallt', a cutting relating to 'Isallt' from the News Chronicle, n.d., and poetry in Welsh and English, 1911-1913, in 'Isallt's hand.