Keep Our Secrets Secret campaign The only safe safe is a locked safe poster

Date: 1930-1970 Reference: EXT 1/111 (1) Creator: Documents and objects extracted from various record series Catalogue context: 13 items extracted from INF 13/204 . Flyers concerning security. Categories: Military Subjects: Cold War; Archives and libraries Topics: Military and war Period: Interwar Copyright information: Copyright clearance for publication is not required, except in the case of documents in third-party copyright. Usage terms: https://www.nationalarchives.gov.uk/documents/information-management/use-of-tna-materials.pdf