Catalogue of the well-known Collection of Paintings and Drawings by John Constable, ..., also important Water-Colours and Drawings by Bonington, Gainsborough and Girtin : : Oil Paintings by Cotman and Richard Wilson ; Fine modern Pictures by Sickert and Utrillo ; The Property of Dr. H.A.C. Gregory (Sale London, Sotheby & Co., 20.07.1949). boek