00279nam a2200109Ia 4500008004100000100001300041245004200054250000800096260004400104300000900148650001200157191201s2011    xx            000 0 und d  aDESWAL,S 0aBasic Course in Environmental Studies  aRep  c2011bDhanpat Rai Pub (P) LtdaN. Delhi  aMISC  aAPPLIED