00286nam a2200109Ia 4500008004100000020001800041082001500059100001000074245005300084260002700137300001200164190710s9999    xx            000 0 und d  a81-7450-989-5  a510.72 N21  aNCERT 0aLaboratory manual mathematics at secondary stage  aNew DelhibNCERTc2009  axvi,203