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Start Over Collections Medicine in the Americas, 1610-1920 ✖Remove constraint Collections: Medicine in the Americas, 1610-1920 Subjects Hearing Aids ✖Remove constraint Subjects: Hearing Aids Authors Campbell, James A. (James Alexander), 1847-, author ✖Remove constraint Authors: Campbell, James A. (James Alexander), 1847-, author

1. Helps to hear

Author(s):
Campbell, James A. (James Alexander), 1847-, author
Publication:
Chicago : Duncan Brothers, 1882
Subject(s):
Hearing Aids
Hearing -- physiology

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  • Campbell, James A. (James Alexander), 1847-, author1