III · Science
Abraham Lincoln’s Cyphering Book and Ten other Extraordinary Cyphering Books
Subjects
Mathematics, study and teaching · Cipher and telegraph codes · Ciphers · Mathematics · Study and teaching · Problems, exercises
Language
ENG
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![Cover of [William Wheeler Hubbell, authorized to apply for patents.] by United States. Congress. Senate. Committee on Patents](/img/cover/10200621-M.jpg)
