Can you crack the code?

"Codes can carry big secrets! Throughout history, lots of good guys and lots of bad guys have used codes to keep their messages under wraps. This fun and flippable nonfiction features stories of hidden treasures, war-time maneuverings, and contemporary hacking as well as explaining the mechanic...

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Bibliographic Details
Main Author: Schwartz, Ella
Format: BOOK
Published: Bloomsbury 2019