Letter from T.G. Hetherington to G.I. Lloyd, Historical Records Branch, Ministry of Munitions re armour plate experiments
Pigeon Post to Lewis Gun; Cavalry Charge to Mark VIII Tank: Evolving Technology in World War I
Place: Royal Air Force Headquarters, York House, Leamington
23 December 1918
McMaster University Libraries
Copyright, public domain: McMaster University owns the rights to the archival copy of the digital image in TIFF format.