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020 _c54
040 _aMAIN
041 _aEnglish
082 _a530
_bKUM
100 _aKumar, Arvind
245 _aPhysics
_cArvind Kumar
260 _bNational council of educational
_aNew Delhi
_c1921
300 _bV.1;P.1
_a246p.
_c24cm.
650 _aPhysics
942 _cBK
999 _c5946
_d5946