00285nam a2200109Ia 450000500170000000800410001708200170005810000170007524500430009226000310013530000090016620260205102650.0260111s9999||||xx |||||||||||||| ||und||  a570.7  M313T  aMangal, S. K 0aTeaching of physical and life sciences  aNew DelhibArya bookc1991  a397p