TY  - BOOK
TI  - World history
U1  - 930 
PY  - 1950///
CY  - Kottayam
PB  - Mac-Millan Pub.  Co.  
KW  - HistoryTheory Of Vibraqtion Vibrating System And Sources Of Sound Transmission Of Sound Thechnical Application Reception Tranmation And Measurement Of Sound Energy
ER  -