000 00288nam a2200109Ia 4500
008 230822s1999 xx 000 0 und d
041 _aeng
100 _aCOWAN H.J. & SMITH P. R.
245 _aENVIRONMENTAL SYSTEMS.
260 _bVAN NOSTRAND REINHOLD CO. PVT LTD.
_c1999
300 _a240
999 _c855499
_d855499