Air Defence Research Sub-Committee Correspondence with Sir Maurice Hankey, Secretary, CID; F A Lindemann (later Lord Cherwell) (2); Sir Philip Cunliffe-Lister (later Lord Swinton), Sec. of State for Air, on the expansion of the RAF, war industrial organisation and anti-aircraft defence and research; A P Rowe, Joint Secretary, ADR Sub-Committee on infra-red detection (2).