How to Keep a Secret - James, Elizabeth, and Barkin, Carol

Presents various methods of writing, speaking, and signaling secret messages.

How to Keep a Secret 1998, HarperCollins Publishers, New York, NY

ISBN-13: 9780688162771

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How to Keep a Secret 1998, HarperCollins Publishers, New York, NY

ISBN-13: 9780688162788

Trade paperback

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How to Keep a Secret 1986, Yearling Books

ISBN-13: 9780440734833

Trade paperback

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