00269nam a2200109Ia 4500008004100000041001200041082001100053100001600064245006700080260000600147650000600153221030s9999    xx            000 0 und d  aEnglish  a105.23  aS. K. Gupta 0aEngineering Physics Vol.IV Wave Motion & Soundcby S. K. Gupta  c0  aB