00282nam a2200109Ia 450000500170000000800410001702000150005808200230007310000220009624500270011826000270014520260205054730.0260111s9999||||xx |||||||||||||| ||und||  a8176465887  a338.60420954 D262R  aDatta , Saktipada 0aResources of our earth  aDelhibB. R. pubc2007