000 00303nam a2200157Ia 4500
020 _a81-7488-563-3
082 _a541
100 _aArora M.G.
245 0 _aP-block Elements
250 _a-
260 _aN. Delhi
_bAnmol Prakashan
300 _a291
500 _a1727
650 _a-
942 _cBK
999 _c36963
_d36963