Text: "Mass, energy and power." This may be the German version of: "The problem of increasing Human energy. With special reference to the harnessing of the sun's energy." The Century Magazine. 60(2), June 1900. p. 175-211. Information supplied by John T. Ratzlaff, Tesla's bibliographer. (in German). n.d. Columbia University Libraries, Special Collections. (116 p. ; title and p. 1-4 lacking).

See Also: Nikola Tesla, history.

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