Discusses and provides practice in making and breaking codes and ciphers, as well as in building simple coding devices to transmit secret messages.
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Book Description Simon & Schuster Children's Publishing. Hardcover. Book Condition: New. 0027478106 NEW Hardcover, AL41 ~ Durable library style binding ~ strong hinges, beautiful cover art ~ media mail delivery is free, Your orders are meticulously inspected, packed securely, and shipped fast, quick responsive customer service insures customer satisfaction, and our feedback score speaks louder than words, international and expedited shipping for most items. Bookseller Inventory # SKU1037083
Book Description Simon & Schuster Children's Publishing, 1984. Hardcover. Book Condition: New. First Edition. Bookseller Inventory # DADAX0027478106