Manuscript orchestral and vocal scores of Christmas choral works, mainly carols, composed or arranged by Mansel Thomas for mixed voices.
Manuscript orchestral and vocal scores of Christmas music composed or arranged by Mansel Thomas for solo voice, unison voices or for two or three voices.
Manuscript scores of miscellaneous arrangements by Mansel Thomas for male voices, comprising both secular and sacred music.
Manuscript scores of arrangements for solo instruments, both with and without accompaniment.
Manuscript scores of miscellaneous works and exercises for choirs of mixed voices.
Manuscript scores of compositions or arrangements for two and three female voices.
Orchestral arrangements of Welsh traditional melodies,
Manuscript scores of orchestral arrangements by Mansel Thomas of Welsh folk songs.
Workbooks and manuscripts compiled during the period 1918-1930. The earliest workbook of music was compiled with the help of his father, Theophilus Thomas. The majority of this group date from the time he was at the Royal Academy of Music in London, and received his external B.Mus degree from Durham University.
Small group of miscellaneous sketches and fragments of his work. Many were composed after he had suffered a stroke in September 1979.