TY  - BOOK
ED  - Medical Research Council (Great Britain).
TI  - Hearing aids and audiometers: report
AV  - RF300 .M4 1947
U1  - 617.8078 
PY  - 1947///
CY  - London
PB  - H.M. Stationery Off.
KW  - Hearing aids
KW  - Audiometry
N1  - Includes bibliographies
ER  -