00285nam a2200109Ia 450000500170000000800410001702000180005808200200007624500390009626000310013530000090016620260205063315.0260111s9999||||xx |||||||||||||| ||und||  a9789350121030  a363.7076  G959U 0aUGC - NET : environmental sciences  aNew DelhibO.P. gupta pub.  aV.P.