Writing Secret Codes and Sending Hidden Messages Sterling Publishing Company, 1984 - 127 páginas Explains how to use secret codes, including Morse, Caesar's, Sandwich, Rosicrucian, and others, as well as how to send hidden messages using invisible ink, how to take fingerprints, and other tricks and techniques. |
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Writing Secret Codes and Sending Hidden Messages Gyles Daubeney Brandreth No hay ninguna vista previa disponible - 1984 |