Hearing aids /
Saved in:
| Main Author: | |
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| Format: | Book |
| Language: | English |
| Published: |
Washington, D.C. :
U.S. National Bureau of Standards; for sale by the Supt. of Docs., U.S. Govt. Print. Off.,
1970.
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| Edition: | [Rev.] |
| Series: | NBS monograph ;
117. |
| Subjects: |
| Item Description: | "A United States Department of Commerce publication." "CODEN: NBSMA." |
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| Physical Description: | iv, 24 p. : ill. ; 26 cm. |