by Denis Pic Lelièvre, Élie Zéda · Editorial Zendrera Zariquiey, S.A. · tapa blanda · ISBN 9788484183860
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Discover the best kept secrets of history with this fascinating book. Learn to create and decipher secret codes, from sign language to Morse code, and become a secret agent or expert detective. Ideal for children aged 8 to 9, this book will provide you with all the keys to communicate safely and reveal the mysteries around you.
