00363nam a2200121 a 4500020001500000100001700015245004000032260004500072300001300117650003300130700001900163856005900182  a81219165421 aAsthana, D K10aEnvironment: problems and solutions  aNew Delhi :bS.chand and company,c2010.  a434 p. ;  aEnvironmental Engingineering1 aAsthana, Meera40uhttp://www.amazon.com/exec/obidos/ASIN/chopaconline-20