Mary, Queen of Scots, sealed her final missive with an intricate spiral letterlock | Ars Technica
Mary, Queen of Scots execution: Monarch used 'spiral locking' technique to preserve the secrecy of her last letter | CNN
Mary, Queen of Scots, sealed her final missive with an intricate spiral letterlock | Ars Technica
Techniques Mary, Queen Of Scots And Elizabeth I Used To Keep Their Letters Secret Revealed | IFLScience
The clever folds that kept letters secret - BBC Future
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Scholars uncover spiral-locked letters of Elizabeth I and Mary, Queen of Scots : NPR
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How to wear a Spiral Lock - Video Tutorial - CrafterElena
How to wear a Spiral Lock - Video Tutorial - CrafterElena
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Letterlocking: Catherine de' Medici's concealed spiral-locked letter to Raimond de Beccarie (c.1570) - YouTube
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New Technique Reveals Centuries of Secrets in Locked Letters - The New York Times
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New Technique Reveals Centuries of Secrets in Locked Letters - The New York Times
The clever folds that kept letters secret - BBC Future
Unlocking history through automated virtual unfolding of sealed documents imaged by X-ray microtomography | Nature Communications
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The clever folds that kept letters secret - BBC Future
