| Type | Book |
|---|---|
| By | Luger, Jack, author. |
| Contributors | Martin, Kevin, illustrator. |
| Languages | English |
| Publisher | Port Townsend, Washington : Loompanics Unlimited, [1990] |
| Copyright | ©1990 |
| Physical Description | 121 pages ; 22 cm |
| ISBN | 1559500344 |
| Subjects | Cryptography. |
| Holdings |
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