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020 _a8171699529
082 _a507.103
_bSEN
100 _aSen, B. R.
245 _aEncyclopaedia of teaching science
_cB. R. Sen
260 _aNew Delhi
_bCommonwealth
_c2021
300 _a236p.; v.3 - Teaching science in secondary schools
650 _aSpecial Educaton
650 _aEducation
650 _aScience - In Teaching
942 _2ddc
_cBK