00305nam a2200109 a 450000500170000000800410001704100080005810000190006624500540008526400450013930000110018420260717091748.0260717s2000    ii            000 0 eng d  aeng1 aKawatra, P. S.10aTextbook of information science /cKawatra, P. S. 1aNew Delhi :bA. P. H publication,c2000.  a323 p.