00274nam a2200109Ia 450000500170000000800410001708200140005810000180007224500210009026000450011130000080015620260224040842.0260224s9999||||xx |||||||||||||| ||und||  a363.7 AGA  aAgarwal, S.K. 0aEco-informatics   aNew Delhi: Viva Books Private Ltd.c2002  a390