Helps to hear

Helps to hear

Collection:
Medicine in the Americas, 1610-1920
Author(s):
Campbell, James A. (James Alexander), 1847-, author
Publication:
Chicago : Duncan Brothers, 1882
Language(s):
English
Format:
Text
Subject(s):
Hearing Aids
Hearing -- physiology
Copyright:
The National Library of Medicine believes this item to be in the public domain (More information)
Extent:
108, 12 pages
Illustrations:
Illustrations
NLM Unique ID:
67740780R (See catalog record)
Permanent Link:
http://resource.nlm.nih.gov/67740780R