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Subjects
Ciphers, Juvenile literature, Cryptography, Science, experimentsShowing 1 featured edition. View all 1 editions?
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Book Details
Published in
Philadelphia
Edition Notes
Activity kit (29 cm. x 20 cm.) includes two sets of semaphore flags, two Jefferson wheels, two sheets of Braille stickers, two Morse code units, two wires for Morse code units, and instructions.
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The Physical Object
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Feedback?September 17, 2022 | Edited by ImportBot | import existing book |
April 28, 2010 | Edited by Open Library Bot | Linked existing covers to the work. |
February 1, 2010 | Edited by WorkBot | add more information to works |
December 9, 2009 | Created by WorkBot | add works page |