TECHNOLOGY
(3) 4-6 Communicating series. Each of these books describes encoded signaling systems in a similar format: an introduction defines the manner of sending/receiving messages (electricity, sound waves), and historical background describes code development and wartime applications. Tools, modern uses, and careers are covered, as well as modern computer encryption and medical technologies. Captioned photos accompany the readable text. Reading list. Glos., ind. [Review covers these Communicating titles: Ciphers and Codes, Morse Code, and Sonar.]

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