Correspondence from the following: Dr P Donlan (Chester Beatty Library); C G J Emmins; A Freeman (Institute of Bankers); R MacGregor; G A MacKenzie; D Shoenberg; R Wood (Herbert Hoover Presidential Library). Also includes letters from F P Thomson to the Blumlein family and Professor Hanbury Brown.
Includes information on Blumlein's father and his connection with Herbert Hoover and the wider family history.
