The correspondence includes letters from: Sir Thomas Barlow, Martin Bodmer, Melbert B. Cary, Sir Kenneth Clark, Sydney Cockerell, Harvey Cushing, Ignaz Emrich, Delius Giese, Zoltan Haraszti, Philip Hofer, Robert Lehmann, Benno Lewy, Tammaro De Marinis, Seymour de Ricci and many antiquarian houses.