Helmholtz, Hermann von, 1821-1894.
New York : Dover Publications, [1954]
2d English ed., translated, thoroughly rev. and corrected, rendered conformal to the 4th (and last) German ed. of 1877, with numerous additional notes and a new additional appendix bringing down information to 1885, and especially adapted to the use of music students, by Alexander J. Ellis. With a new introd. (1954) by Henry Margenau.
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