000 00262nam a2200109Ia 4500
008 191024s9999||||xx |||||||||||||| ||und||
100 _aGulati R N
245 0 _aHamari Nausena
260 _bNational Book Trust
_aNew Delhi
_c1976
650 _aScience
942 _cBK
999 _c54729
_d54729