1. Add MS 30840 Reference (shelfmark): Add MS 30840 Title: 'Recueil de Duo[s]'. Volume 1. Upper part. Collection Area: Music Collections Languages: French Date Range: 1757 Extent: 1 volume (107 folios)
2. Add MS 30841 Reference (shelfmark): Add MS 30841 Title: 'Recueil de Duo[s]'. Volume 2. Lower part. Scope & Content: Vol. II. ff. 99. Music: Duets: 18th cent. Collection Area: Music Collections Languages: English Date Range: 1757 Extent: 1 volume (99 folios)