00426nam a2200181Ia 4500003000400000005001700004008004100021020001800062040000700080041000800087082001500095100001600110245003400126260004800160300000900208650001400217700001300231OSt20250822153007.0250729s2004    xx            000 0 und d  a9788171419135  cAL  aeng  a540.7 KUMM  aKumar Sunil  aMethods of teaching chemistry  aNew DelhibDiscovery Publishing Housec2004  a339p  aChemistry  aKosalani