espionage, code, secret signs of Russian agents for Austrian and German railway trains in the 1st world war, 1914 - 1918, Additional-Rights-Clearance-Info-Not-Available

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Additional-Rights-Clearance-Info-Not-Available

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Size: 3882px × 5354px
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Photo credit: © INTERFOTO / History / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: 1910s, 20th, activity, agent, agents, alphabetic, austrian, ballot, century, cipher, code, codes, codification, coding, codings, cryptography, encoding, encodings, encryption, espionage, historic, historical, identification, identifier, identifiers, label, number, russian, secret, service, sign, signs, symbol, symbols, war, wars, world