The Trumbull books were consigned to auction by the 8th Marquess of Downshire (d. 2004; obit.). The dispersal of the Trumbull books, extracted from Easthampstead estate, near Bracknell, was distributed across six sales, during 1990 and 1991, as follows:
❧ 1. Atlases, travel and natural history … : days of sale: Thursday 21st June 1990 …, Friday 22nd June 1990 …; Sotheby’s …, 34-35 New Bond Street, London. … the Property of the Most Honourable the Marquess of Downshire: Lots scattered throughout. Cf. lots 356, 360-63, 365-67. ❧ ❧ 2. English Literature and History: Including Books from the Library of the … Marquess of Downshire, Thursday 19th July 1990 .. Sotheby’s …, 34-35 New Bond Street, London. Lots 29-36, 47-50, 358-60, 381-95 [30 lots]. ❧ ❧ 3. Books and maps : Sotheby’s London [sale held during four days] 22nd-23rd October 5th – 6th November 1990. On the fourth day of sale: Tuesday 6th November 1990 lots 965-1232 were sold. These included “The Property of the Most Honourable the Marquess of Downshire Various Subjects including Science and Medicine,” Lots 910-964 [54 lots]. ❧ ❧ 4. Continental and Russian books and manuscripts, science and medicine … : day of sale: Tuesday 20th November 1990 …; Sotheby’s …, 34-35 New Bond Street, London. … the Property of the Most Honourable the Marquess of Downshire: Lots 223-227, 329-332 [9 lots]. ❧ ❧ 5. English literature and history … : Thursday 13th December 1990 …; Sotheby’s …, 34-35 New Bond Street, London. … the Property of the Most Honourable the Marquess of Downshire: Lots scattered throughout, e.g. 353. ❧ ❧ 6. Printed books and maps: 5. and 19. February 1991. Sotheby’s … London. …. the Property of the Most Honourable the Marquess of Downshire: Lots 687-762 [75 lots].

Bookplate in: John Kersey, Title: The Elements of that Mathematical Art Commonly called Algebra, Expounded in Four Books. London, Printed by W. Godbid, for T. Passinger and B. Hurlock, 1673-1674. Call number (Ex) QA33 .K4 1674q. (Sotheby’s, London, Feb. 19, 1991, lot 727).