00281nam a2200109Ia 4500008004100000020001800041082001500059100002200074245002500096260004200121300000800163190710s9999    xx            000 0 und d  a81-7341-233-2  a371.3078 R  aRuhela, Satya Pal 0aEducation technology  aDelhibIndian Publishers Distric2002  a362