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Difference-Tone Apparatus, Koenig's

  Source   Stoelting, C. H. 1930. Apparatus, Tests and Supplies for Psychology, Psychometry, Psychotechnology, Psychiatry, Neurology, Anthropology, Phonetics, Physiology, and Pharmacology. Chicago (Collection Rand B. Evans) view the source
  People   Koenig, Rudolph (1832-1901)
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ISSN 1866-4784: reference - xlink