000			a
080			_a021.05 _bPAV
999			_c66492 _d66492
003			OSt
008			180328b ||||| |||| 00| 0 eng d
020			_a9844876401
100			_apavithra
245			_aInformation Retrieval
250			_a2nd ed
260			_bpushpa limited _c2018
942			_2ddc _cBK