00359nam a2200145Ia 4500003000400000005001700004008004100021040000700062041000800069082001500077100002500092245003500117260005200152300000900204OSt20260724152124.0260720s2006    xx            000 0 und d  cAL  aeng  a780.7 LAKT  aSingh, Y Chakradhara  aTechniques of teaching science  aNew DelhibOrbis Books Sonali Publicationc2006  a213p