000			00322nam a22001337a 4500
999			_c15525 _d15525
003			OSt
008			180913b ||||| |||| 00| 0 eng d
082			_a628 _bNAR/EN
100			_aNarayana rao, N _93304
245			_aEnvironmental engineering
260			_aNew Delhi _bTata mcgraw hill _cc1993
300			_a268
942			_cBK