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32 pages • first pub 1969 (view editions)
ISBN/UID: 9780020449706
Format: Paperback
Language: English
Publisher: MacMillan Publishing Company
Edition Pub Date: 28 October 1969
Description
Introduces ten encoding methods using numbers, rearranged letters, colored squares and dots, and other systems. Provides a message to decipher with each method.
Community Reviews
Content Warnings
32 pages • first pub 1969 (view editions)
ISBN/UID: 9780020449706
Format: Paperback
Language: English
Publisher: MacMillan Publishing Company
Edition Pub Date: 28 October 1969
Description
Introduces ten encoding methods using numbers, rearranged letters, colored squares and dots, and other systems. Provides a message to decipher with each method.
Community Reviews
Content Warnings