Spy Techniques of the Revolutionary War: Culper Code Book
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Culper Spies TBR News Media
The Culper Spy Ring: The American Revolution's Great Secret - Warfare History Network
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The Founding Fathers' Secret Encryption Techniques - The Atlantic
The Culper Ring: A Captivating Guide to George Washington's Spy Ring and its Impact on the American Revolution by Captivating History, Paperback
Washington's Spies - Museum of the American Revolution
The Culper Spy Ring (for Kids) - Nicki Truesdell
Spycraft in TURN: Nathaniel Sackett's Anachronistic Gadgets (Or: What year is this again?) « TURN to a historian
Cryptology in the American Revolution: Steganography Part 2
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