De fvrtivis literarvm notis, vulgo, De ziferis libri IIII (1563)

Porta, Giambattista della, approximately 1535-1615 · Neapoli : Apud Ioa. Mariam Scotum · leaf 101

Ciphers · Cryptography · Signs and symbols

Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.

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