000 00326nam a2200133Ia 4500
008 170101s1997 xx 000 0 und d
020 _a9788173710926
100 _aSurendra Verma
245 0 _aFact Science Facts
260 _aNew Delhi
_bUniversities Press
_c1997
300 _a238
650 _aGeneral
942 _2ddc
_cBK
999 _c780643
_d780643