A Catalogue of a valuable assemblage of drawings by old masters, chiefly of the Italian school ... : being a reserved part of the collection of the late Sir J. Reynolds ... and some books of prints, antiquities &c. among which are ... the Marlborough gems, the property of the Dowater Marchioness of Thomond ... which will be sold by auction ... by Mr. Christies ... on Wednesday, May the 16th, 1821 ...