Hearing aids.
| Author/creator | Corliss, Edith L. R. |
| Format | Book |
| Publication Info | Washington : For sale by the Supt. of Docs., U.S. Govt. Print. Off, 1970. |
| Description | iv, 24 pages : illustrations ; 27 cm. |
| Subjects |
| Series | National Bureau of Standards monograph 117 NBS monograph ; 117. ^A329613 |
| General note | Supersedes the Bureau's Circular 534. |
| LCCN | 74606242 |
| Govt. docs number | C 13.44:117 |