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Sinopsis

Throughout history, army generals, spies, and even scientists have guarded information through secret codes. Find out how they did it and learn how to create your own secret codes. You and your friends can share secrets that will leave everyone else scratching their heads.

Duración: 21 minutos (00:20:31)
Fecha de publicación: 01/03/2013; Unabridged; Copyright Year: — Copyright Statment: —

• Novela juvenil