Bound To Stay Bound

		Spy Communication  Author: Olson, Elsie  Publisher: Abdo Publishing (-1)  Dewey: 900  Classification: Nonfiction  Physical Description:   BTSB No: 690020  ISBN: 9781098293147  Ages: 10-14  Grades: 5-9
	Price: $28.16

Summary:
Learn how spies used covert communication techniques such as secret codes, invisible ink, and tiny cameras to pass intelligence to their handlers. Real-life spies and missions are explored. Readers can also try making their own invisible ink, dead drops, and secret codes.