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100 1 _a"kumar, krishan . "
_923834
245 1 0 _alibrary manual:
_b/
_c krishan.. kumar
250 _a4 ed.
260 _aindia :
_bvikas
_c1991.
300 _a"xii, 386p.;
_c22 cm."
650 0 _alibrary science
_91212
942 _2lcc
_cBK
_hZ675
999 _c40419
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