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      Scientific American April 28, 1894

      The Effects on the Vocal Chords of Improper Method in Singing

      • By H. Holbrook Curtis on April 28, 1894

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      More in the April 28, 1894 issue of Scientific American
      • A New Electro-Dynamometer
      • Edison's Phonographic Levee
      • Roosting Butterflies
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