11. MS Mus. 1804/1/4/3/3 Reference (shelfmark): MS Mus. 1804/1/4/3/3 Title: Thea Musgrave: 'The Decision', opera. Full score. Act 3 Collection Area: Music Collections Languages: English Date Range: 1965 Extent: 1 volume
12. MS Mus. 1804/1/4/5/1 Reference (shelfmark): MS Mus. 1804/1/4/5/1 Title: Thea Musgrave: 'The Decision', opera. Main vocal score. Act 1 Collection Area: Music Collections Languages: English Date Range: 1965-1967 Extent: 1 volume
13. MS Mus. 1804/1/4/5/2 Reference (shelfmark): MS Mus. 1804/1/4/5/2 Title: Thea Musgrave: 'The Decision', opera. Main vocal score. Act 2 Collection Area: Music Collections Languages: English Date Range: 1965-1967 Extent: 1 volume
14. MS Mus. 1804/1/4/5/3 Reference (shelfmark): MS Mus. 1804/1/4/5/3 Title: Thea Musgrave: 'The Decision', opera. Main vocal score. Act 3 Collection Area: Music Collections Languages: English Date Range: 1965-1967 Extent: 1 volume
15. MS Mus. 1804/1/4/2/1 Reference (shelfmark): MS Mus. 1804/1/4/2/1 Title: Thea Musgrave: 'The Decision', opera. Draft: Act 1 Scope & Content: (1.) Act I. (2.) A few leaves resembling a fair copy, with significant emendations to the part for John Brown. Collection Area: Music Collections Languages: English Date Range: 1965 Extent: 1 volume