00274nam a2200109Ia 450000500170000000800410001704100080005808200160006610000170008224500310009926000340013020260720174840.0260720s2005    xx            000 0 und d  aeng  a900.50 AGGT  aAggarwal J C  aTeaching of Social Studies  aNoidabVikas Publishingc2005