| Type | Book |
|---|---|
| By | Zim, Herbert S. (Herbert Spencer), 1909-1994, author. |
| Languages | English |
| Edition | Abridged edition. |
| Publisher | New York : Scholastic Book Services, [1958] |
| Copyright | ©1948 |
| Physical Description | 115 pages : illustrations ; 20 cm |
| Subjects | Cryptography. |
| Holdings |
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