00358nam a2200133Ia 4500008004100000020001500041041001200056082001600068100001600084245006800100260003400168300001000202650001200212221030s9999    xx            000 0 und d  a8187224223  aEnglish  a105.23bGup  aS. K. Gupta 0aEngineering Physics Vol. IV Wave Motion & Soundcby S. K. Gupta  bKrishna Pub.aNew Delhic2001  a4.292  aPhysics