Wikimedi'Òc

Codebook.jpg - OS

Obsolete chinese telegraph code.jpg - Kimura Aichi

Telegraphic Dictionary of the English Language (advertisement from "Dame Europa's School").png - Antonsusi

Germany telephone code sheet, first page, found 1918 - National World War I Museum - Kansas City, MO - DSC07711.JPG - Daderot

Cipher No 9, Union Telegraphic Cipher Book, c. 1861-1862, used by General Joseph Hooker at the battle of Chancellorsville, Virginia, to secure messages sent by telegraph - National Cryptologic Museum - DSC07713.JPG - Daderot

Great Cipher.png - Meidosensei

German naval code 1920s.agr.jpg - ArnoldReinhold

KGB Victory Code pages at National Cryptologic Museum.agr.jpg - ArnoldReinhold

Phillips Code 1879 first page.agr.jpg - ArnoldReinhold

Acme Commodity and Phrase Code book cover.png - The Quirky Kitty