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Academic Disciplines
Humanities
History
Recorded History
Documents
Types of Document
Letters (messages)
Document Security Methods
Letterlocking
Attachments
Letterlocking - Wikipedia
Parents
Document Security Methods
Children
Cracking the Code of Letterlocking
Fig. 7: Letterlocking categories and formats chart.
Mary Queen of Scots’ last letter, a spiral lock, England (1587)
Unlocking history through automated virtual unfolding of sealed documents imaged by X-ray microtomography