L. Douglas Keeney

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Books by L. Douglas Keeney

Secret Messages

Concealment Codes And Other Types Of Ingenious Communication

By William S. Butler and L. Douglas Keeney

From the fall of Troy to interstellar messages by way of the Underground Railroad and Captain Midnight, Secret Messages is a collection of ninety-five of the most interesting examples of code and concealed communications throughout history. Authors William S. Butler and L. Douglas Keeney have co...

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