Code Busters!
Books / Hardcover
Books › Juvenile Nonfiction › General
ISBN: 0807512354 / Publisher: Albert Whitman & Co, August 1985
Presents an illustrated explanation of twenty-five codes that can be used to send secret messages.
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Describes how messages can be disguised by dots and boxes, skyscrapers of color, upper-case letters and lower, phone numbers, musical flags, computer printouts, and card decks
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