00331nam a2200121Ia 4500008004100000020001800041082001500059100001800074245005400092250001100146260004400157300000800201190710s9999    xx            000 0 und d  a0-7069-7662-2  a372.83 Ag3  aAggarwal, J C 0aTeaching of social studies : a practical approach  a4th ed  aNew DelhibVikas Publishing Housec2011  a447