STRAND
MAGAZINE, buried treasure and a coded box
SIXTEENTH
AND SEVENTEENTH CENTURY CYPHERS (Thompson and Padover)
Johannes
Trithemius, Polygraphie, Paris 1561(with moving part)
KEN magazine 1938, codes on bald heads and musical notation
Seleni,
A Treatise on Cryptography 1524
Leo Marks, Between Silk and Cyanide, biblio
W and E Friedman , The Shakespearean Ciphers Examined, selection of images
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