Kryptographik
"Kryptographik Lehrbuch der Geheimschreibekunst (Cryptology: Instruction Book on the Art of Secret Writing) is an 1809 book on cryptography written by Johann Ludwig Klüber." [Kryptographik, Wikipedia]
Dr. Armitage consulted Klüber's Kryptographik while attempting to decipher Wilbur Whateley's diary [HPL Dunwich (online text)].
By Philip Thicknesse. Alijah Atwood wrote that he saw a copy of "Thicknesses’s" (stet) Kryptographik in the library of Dr.
Jean-Francois Charriere [AWD Survivor (online text)].
Atwood may have conflated Klüber's Kryptographik with a 1792 work by Phillip Thicknesse called A Treatise On The Art Of Decyphering, And Of Writing In Cyphers,With An Harmonic Alphabet. [Philip Thicknesse, Wikipedia] A scan of the book is available at the Internet Archive.
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