TY  - RPRT
TI  - Horn design equations for the NBS horn-type noise standards 
AU  - Daywitt, William C
PY  - 1987
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 87-3073
DO  - 10.6028/NBS.IR.87-3073
ER  -