A Text book of environmental studies /
Chawla, Shashi.
A Text book of environmental studies / by Shashi Chawla. - New Delhi : Tata McGraw Hill Education, 2012. - 1 vol (various pagings.) ;
1259006387 :
Human ecology--Study and teaching.
A Text book of environmental studies / by Shashi Chawla. - New Delhi : Tata McGraw Hill Education, 2012. - 1 vol (various pagings.) ;
1259006387 :
Human ecology--Study and teaching.