ENVIRONMENTAL STUDIES BY KAUSHIK
http://books.google.co.in/books?id=7MHHp2Bg44YC&printsec=frontcover&dq=environmental+studies+by+kaushik&hl=en&ei=iVxaTq6_EcrIrQeVgKnQCg&sa=X&oi=book_result&ct=result&resnum=1&ved=0CDQQ6AEwAA#v=onepage&q&f=false
http://books.google.co.in/books?id=xXanh32DfccC&printsec=frontcover&dq=environmental+studies+by+kaushik+and+kaushik&hl=en&ei=UmFaTrOxBpDJrQf66IHMCg&sa=X&oi=book_result&ct=result&resnum=2&sqi=2&ved=0CDcQ6AEwAQ#v=onepage&q&f=false
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