00432nam a22001577i 4500001001000000005001700010008004100027082001900068100002500087245005500112250001000167260004300177300001700220650001900237020001800256SXC01537120260819093602.0260101s1986    ii            000 0 eng d  a539 GUP-C2222  aGupta, S L; Gupta, S10aConcepts of modern physics /cGupta, S L; Gupta, S  a2 ed.  abDhanpat Rai & Sons, New Delhi,c1986  ap. ;c22 cm. 0aModern physics  a9781555281564