Personal correspondence: A Correspondents include: Aberdeen University (RV Jones); H Aberle (Johannesburg); LH Adams (Carnegie Institute, Washington); Dr J Elston Ahlberg (Johns Hopkins University, Baltimore); WA Akers (Directorate of Tube Alloys); Allen and Unwin Ltd (Museum Street, London); Allgeheine Electrcis (Gesellschaft); E Altenkirch (Nelienhagen bei berlin); JF Allen (Royal Society, Mond Laboratory, Cambridge); American Consulate, Cherbourg); T Anders (Berlin); Prof EN da C Andrade (University College, London); Donald H Andrews (Johns Hopkins University, Baltimore); Dr D Arms (Berlin); HS Arms (Montreal); Dr Arndt; Sir Edward V Appleton (DSIR, Teddington); J Ashmead (ADRDE, MoS, Malvern); Aston; RoE Atkinson (Rutgers University, New Brunswick, New Jersey); Prof P Auger (Inst de Biologie Physico, Paris ve Chinique) and Prof Dr F Auerbach. Correspondence with Akers and Appleton relates to Simon's work on the Tube Alloys project during the Second World War. c.1924-1956