000 00296nam a2200109Ia 4500
008 201208s9999 xx 000 0 und d
100 _aINDIAN STANDARD INSTITUTION
245 0 _aINDIAN STANDARD RECOMMENDATION FOR A COUSTICAL DESIGN
260 _bISI ,NEW DELHI
_c1970
300 _a9
942 _cBK
999 _c10804
_d10804