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Code Busters!
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School and Library
from Albert Whitman & Co (August 1, 1985)
9780807512357 | details & prices | Rec. grade levels 4-6 | List price $11.95
About: 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
About: 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