TY  - BOOK
AU  - Zwikker,Cornelis
AU  - Kosten, C.W.
TI  - Sound absorbing materials / 
U1  - 534.2 ZWI 
PY  - 1949///
CY  - New York : 
PB  - Elsevier Pub. Co , 
KW  - Sound
KW  - Transmission
ER  -