1. MS Mus. 1229-1232 Reference (shelfmark): MS Mus. 1229-1232 Title: Stephen Oliver: 'Slippery Soules' Scope & Content: Opera, for female voices, violin, piano, organ and percussion; 1969, revised 1988. Published by Chester Novello. Collection Area: Music Collections Languages: English Date Range: 1969-1988 Extent: 4 volumes
2. MS Mus. 1230 Reference (shelfmark): MS Mus. 1230 Title: Stephen Oliver: 'Slippery Soules'. Full score (1976 version) Scope & Content: Revised July 1976. Photocopy. Collection Area: Music Collections Languages: English Date Range: 1976 Extent: 1 volume (53 folios)
3. MS Mus. 1229 Reference (shelfmark): MS Mus. 1229 Title: Stephen Oliver: 'Slippery Soules'. Full score (1969 version) Scope & Content: With annotations. Dated August 1969. Collection Area: Music Collections Languages: English Date Range: 1969 Extent: 1 volume (55 folios)
4. MS Mus. 1231 Reference (shelfmark): MS Mus. 1231 Title: Stephen Oliver: 'Slippery Soules'. Full score (1988 version) Scope & Content: 1988 orchestration. Written in pencil, with many amendments pasted in. Collection Area: Music Collections Languages: English Date Range: 1988 Extent: 1 volume (925 folios)
5. MS Mus. 1232 Reference (shelfmark): MS Mus. 1232 Title: Stephen Oliver: 'Slippery Soules'. Vocal score (1988 version) Scope & Content: Typescript libretto (ff. 1-9) and vocal score, in ink (ff. 10-147). Collection Area: Music Collections Languages: English Date Range: 1988 Extent: 1 volume (147 folios)