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32 pages • first pub 1969 (editions)
ISBN/UID: 9780020449706
Format: Paperback
Language: English
Publisher: MacMillan Publishing Company
Publication date: 28 October 1969
nonfiction
childrens
computer science
medium-paced
Description
Introduces ten encoding methods using numbers, rearranged letters, colored squares and dots, and other systems. Provides a message to decipher with each method.
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Content Warnings
32 pages • first pub 1969 (editions)
ISBN/UID: 9780020449706
Format: Paperback
Language: English
Publisher: MacMillan Publishing Company
Publication date: 28 October 1969
nonfiction
childrens
computer science
medium-paced
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