TY  - RPRT
TI  - Circular of the Bureau of Standards no. 534: hearing aids
AU  - Corliss, Edith L R
PY  - 1953
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CIRC 534
DO  - 10.6028/NBS.CIRC.534
ER  -