"War Service Records of Enlisted Men". The Phi Delta Kappan. 6 (2): 16–18. January 1, 1923. JSTOR20257337.
modernmechanix.com
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The first such machine built in accordance with Dvorak's one-handed layout was designed and constructed by Martin Tytell, also known as "Mr. Typewriter", of New York City. Kursh, Harry. Mechanix Illustrated, January 1951, pp. 74 et seq. See Meet Mr. TypewriterArchived 2009-02-26 at the Wayback Machine
The first such machine built in accordance with Dvorak's one-handed layout was designed and constructed by Martin Tytell, also known as "Mr. Typewriter", of New York City. Kursh, Harry. Mechanix Illustrated, January 1951, pp. 74 et seq. See Meet Mr. TypewriterArchived 2009-02-26 at the Wayback Machine