TY  - RPRT
TI  - Circular of the Bureau of Standards no. 418: architectural acoustics
AU  - Heyl, Paul R
AU  - Chrisler, V L
PY  - 1938
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CIRC 418
DO  - 10.6028/NBS.CIRC.418
ER  -