How to Write Codes and Send Secret Messages

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9780590026062: How to Write Codes and Send Secret Messages
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Explains how to write and decipher space codes, hidden word codes, and alphabet codes and gives formulas for invisible ink. Includes suggestions for delivering coded messages.

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Peterson, John Lawrence
Published by Scholastic Paperbacks (1973)
ISBN 10: 0590026062 ISBN 13: 9780590026062
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John Lawrence Peterson
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Peterson, John Lawrence
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John Lawrence Peterson
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