Manuscript vocal score of 'Broad sound' (words, John Stuart Williams), composed at Treadam, May 1975; and a photocopy with additional ink markings by the composer. Published Magor: Mansel Thomas Trust, Ref: MT148 and MT206 [1998?].
Manuscript vocal score of 'Another picture' (words, Matthew Arnold). Published Magor: Mansel Thomas Trust, Ref: MT134 and MT193 [1998?].
Manuscript orchestral score of 'A hymn to God the Father' (words, John Donne), for baritone and orchestra; together with a score for baritone and a string orchestra, parts for large orchestra and a vocal score. Published Magor: Mansel Thomas Trust, Ref: MT135 [1998?].
Manuscript vocal score of 'Eze-sur-Mer', one of the 'Five Settings of Poems' by Idris Davies = 'Pum Cân': Cerddi Idris Davies. Published: Mansel Thomas Trust, Ref: 150 and MT151.
Four prayers from the gaelic = Pedair gweddi o’r gaeleg,
Manuscript vocal scores of 'Four prayers from the Gaelic' (text from Enid Parry). Titles: Thanks to Thee, O God = Mawl i Ti, O Dduw; Blessing for a house = Tangnefedd Duw; Thou being of marvels = Ti Dduw pob rhufeddod; Bless to me, O God = O bendithia Iôr. Published by Gwynn.
Manuscript orchestral scores and vocal scores of 'In Memoriam-Hywel Davies', a song-cycle on hymns by Pantycelyn for tenor voice and orchestra. Comprising 'Arnat Iesu' orchestral and two vocal scores; 'O Sancteiddia f'enaid' orchestral and three vocal scores; 'Wel, f'enaid dos ymlaen' orchestral score and two vocal scores. Orchestral parts for large orchestra for all three of the songs. Published: Mansel Thomas Trust, Ref: MT192.
Manuscript vocal scores of 'The mask of pity' (words by Bryn Griffiths). Copy two (photocopy) has additional detail inserted by the composer. Also, a cover with the dedication 'for Janet Price'. Published: Mansel Thomas Trust, Ref: MT153 and MT214.
Copy manuscript vocal score of 'Moliannaf di' (words by Dyfed). Includes the Eisteddfod text sheet. Piece commissioned by National Eisteddfod Caernarfon, with the assistance of the Welsh Arts Council. Published: Mansel Thomas Trust, Ref: MT139 and MT228.
Manuscript vocal scores of 'Parable' (words by Alun Lewis). Copy in lower key includes additional markings. Published: Mansel Thomas Trust, Ref: MT156 and MT199.
Manuscript vocal scores of 'The unfading beauty' (an Elizabethan lyric). Orchestral parts in low key (E Maj.), two vocal scores and a full orchestral score in low key, also a vocal score in high key. Published: Mansel Thomas Trust, Ref: MT128 and MT231.
Manuscript vocal scores of 'Water music' (words by Alun Lewis) in the original key. Published: Mansel Thomas Trust, Ref: MT168 and MT217.
Arrangements of traditional melodies,
Manuscript scores (without words) of arrangements of (mostly Welsh) folk songs for solo voice.
Manuscript score of an arrangement of 'Dafydd y garreg wen' for voice, horns, strings and harp. Also, a version for voice, strings and harp, with orchestral parts for both versions. Published: Mansel Thomas Trust, Ref: MT043.
Manuscript orchestral scores and parts of 'Merch Magan' for solo voice and orchestra in F maj. and E♭. No vocal score or text. Published: Mansel Thomas Trust, Ref: MT044.
Manuscript full orchestral score of 'Migildi Magildi', with orchestral parts. Arranged for solo voice, chorus and orchestra. No chorus or vocal score. Published: Mansel Thomas Trust, Ref: MT067.
Manuscript mixed voice chorus and orchestral score of 'Lisa lân'. Includes a vocal solo part and string parts, arranged for solo tenor and chorus. Published: Mansel Thomas Trust, Ref: MT068.
Manuscript vocal score of 'Shôn a Shân', single bass vocal part.
Manuscript parts of incidental music composed by Mansel Thomas.
Manuscript scores of orchestral music by Mansel Thomas, comprising arrangements of Welsh folk songs, other tunes, incidental music; music for brass bands and ensembles (including trio, quartet etc.).
Manuscript full score for 'Y Gelynen', with parts for oboe, viola and cello.