- Elias Longley: "Correct Typewriter Fingering", The Phonographic World, Vol.4, No.5 (January 1889), pp.102-103.
http://kanji.zinbun.kyoto-u.ac.jp/~yasuoka/QWERTY/1889-01Phonographic102.djvu
# Elias Longley: "Dan Brown's Typewriter Fingering", The Phonographic Magazine, Vol.X, No.2 (January 15, 1896), pp.19-20.
http://kanji.zinbun.kyoto-u.ac.jp/~yasuoka/QWERTY/1896-01-15.djvu
"Now is the time to try something true."
The History of Touch Typewriting, Wyckoff Seamans & Benedict, New York (1900).
http://www.kanji.zinbun.kyoto-u.ac.jp/~yasuoka/QWERTY/1900Wyckoff.djvu
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