000 00311nam a2200121Ia 4500
008 190216s9999||||xx |||||||||||||| ||und||
100 _aSubash Chandra Rastogi
245 0 _aPeriodic Classicfication Of Elements
260 _bPragathi Prakashan
300 _a308p
650 _aChemistry-Chemistry
942 _cBK
999 _c2247
_d2247