Secret codes
著者
書誌事項
Secret codes
（Penguin active reading, level 4）
Pearson Education, 2007
- : [pbk.]
- : pack
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内容説明・目次
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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