00292nam a2200109 a 4500008004100000020001500041050001500056100001700071245004000088260004500128350000900173120416s0000    ||||||||||||||||| ||    u  a8171694845  aT 57.5 Dha  aDhawan, K. S10aPrinciples of information retrieval  aNew DelhibCommonwealth Publishersc1997  a0.00