| ISBN: | 9780816040469 |
| Publisher: | Facts On File Inc |
| Published: | 22 May, 2002 |
| Format: | Library Binding |
| Editions: |
2 other editions
of this product
|
The National Institute on Deafness and Other Communication Disorders reports that more than 28 million Americans are deaf or hard of hearing; over 30 million more are exposed to dangerous levels of noise. Levels of hearing impairment vary from mild but important loss of sensitivity to a total loss of hearing. The Encyclopedia of Deafness and Hearing Disorders
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