Zimmermann telegram, de Grey's decipher

Date: 1917 Reference: HW 3/187 Creator: Records created or inherited by Government Communications Headquarters (GCHQ) Catalogue context: Typed decodes of the Zimmermann Telegram, with Admiral Hall's manuscript comments Categories: First World War Subjects: Communications; Intelligence; International; Navy; Personal and family papers Topics: Arts and culture; Family and identity; International trade and affairs; Military and war Period: Early 20th Century 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