I spy

by Diana Noonan

First published 1993 · 24 pages

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About this book

The first story tells how spies hide secret messages. The second story tells how secret messages could be sent to a friend.

  • Spies
  • Juvenile literature
  • Cryptography
  • Ciphers
  • Espions
  • Ouvrages pour la jeunesse
  • Cryptographie
  • Chiffres (Cryptographie)

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