I 029.7 Ken I Kent , Allen Information analysis and retrieval : based on Textbook on mechani ed information retrieval , first and second editions , 1962 and 1966 . New York , Becker and Haye s [c1971] xiii , 367 p . ilus . 23 cm . ( Information sciences series ) "A Wiley-Becker-Hayes Publication " . Bibliografía al final de algunos capítulos .