00450nam a2200169 a 450000500170000000800410001702000180005804100080007608200140008410000140009824500410011225000120015326400530016530000160021865000260023470000200026020260717092634.0260717s1987    ii            000 0 eng d  a9788122426175  aeng04a628.501541 aDe, A. K.10aEnvironmental Chemistry /cDe, A. K.  a7th ed. 1aNew Delhi :bNew Age International,cc1987,2010.  axvii 366 p. 4aEnvironmental Science1 aDe, Arnab Kumar