Discusses codes, silent signals, invisible writing, and other ways to conceal messages.
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Book Description Henry Holt & Company, Inc. Paperback. Book Condition: Good. Ex-Library Book - will contain Library Markings. Light shelving wear with minimal damage to cover and bindings. Pages show minor use. Bookseller Inventory # G0030497167I3N10
Book Description Book Condition: Good. Book Condition: Good. Bookseller Inventory # 97800304971624.0
Book Description Henry Holt & Company, Inc., 1980. Hardcover. Book Condition: Acceptable. cover worn stained. We have 1.5 million books to choose from -- Ship within 48 hours -- Satisfaction Guaranteed!. Bookseller Inventory # mon0000270561
Book Description Henry Holt & Company, Inc., 1980. Paperback. Book Condition: Good. Good condition, some are ex-library and can have markings. Bookseller Inventory # GD-001-76-1924001