McGill Libraries
McLennan Library Building3459 rue McTavish
Montreal, Quebec
H3A 0C9
Photocopy of letter, 4 pages; Letter transcriptions, 8 pages; Photocopies from book, 5 pages; Researcher's correspondence, 3 pages.
King's College, London, College Archives
Printed source: Journal of the Warburg and Courtauld Institute, iii (1939), pp.161-2.