1. 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
2. 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
3. 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