I added information from FMS P-038‘German Radio Intelligence’ and ADM 223/505 ‘Cypher security and W/T (Wireless Telegraphy) deception’ in The Slidex code.
Also added a summary of ‘British intelligence’ vol4 in ‘Book review – British Intelligence in the Second World War’.
Also added a summary of ‘British intelligence’ vol4 in ‘Book review – British Intelligence in the Second World War’.