00413nam a2200181Ia 4500003000400000005001700004008004100021020001900062040000700081041000800088082001500096100001600111245002400127260004500151300000900196650001200205700001400217OSt20251010112113.0250729s2005    xx            000 0 und d  a978-8171694082  cAL  aeng  a500.7 SINT  aSingh Uttam  aTeaching of science  aNew DelhibCommonwealth Publishersc2005  a256p  aScience  aNayak A K