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Secret codes

Ken Beatty

(Penguin active reading, level 4)

Pearson Education, 2007

  • : [pbk.]
  • : pack

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内容説明

For thousands of years people have used codes and ciphers to keep secrets from people who will do anything to learn them. How did secret messages cause a queen to lose her head? How have lost languages finally been understood? How did one little-known language help a country win a war? Read this book and find out.

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