1. RP 64 Reference (shelfmark): RP 64 Title: Scope & Content: Three letters of Thomas Gainsborough to his sister, Mary Gibbon. Christie's sale catalogue, 30 Nov 1966, lot 59 Creation dates: 12, 22, Sep 1777, undated Collection Area: Western Manuscripts Languages: English Date Range: 14 Dec 1966 Extent: 13 photocopies