00326nam a2200121Ia 450000500170000000800410001702000180005808200160007610000280009224500470012026000270016730000100019420260205063749.0260111s9999||||xx |||||||||||||| ||und||  a9789350501627  a363.7  R18P  aRao, Madireddi V. Subba 0aPractical methods in environmental science  aDelhibB.R. pub.c2014  a265p.