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Eileen O'Brien, Diana Riddell
Provides instructions for using codes to send secret messages, and hints for keeping your enemy stumped. Includes a story written in code. Suggested level: primary, intermediate.
| Publisher | E.D.C. Publishing |
|---|---|
| Pages | 32 |
| Format | Paperback |
| Search language | english |
| ISBN_10 | 0-746-02329-4 primary |
| ISBN_13 | 978-0-746-02329-7 primary |
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