https://www.thomasgirtin.com/collection/girtin-exhibitions/sotheby-co-pictures-by-old-masters-the-duke-of-bedford-19-january-1951/period/past
Sotheby & Co., Pictures by Old Masters … The Duke of Bedford, 19 January 1951 | Exhibitions:...
Thomas Girtin (1775–1802): An Online Catalogue, Archive and Introduction to the Artist by Greg Smith
duke of bedfordold masterssothebypicturesjanuary
https://archivesearch.lib.cam.ac.uk/agents/people/1074
Russell, John, 1710 - 1771 (4th Duke of Bedford, statesman) | ArchiveSearch
duke of bedfordrusselljohnstatesman