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Armstrong, C.J.; Keen, E.M.: Workbook for NEPHIS and KWAC : Microcomputer printed subject indexes teaching package, Pt.1 (1982)
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Keen, E.M.: ¬The Aberystwyth index languages tests (1973)
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Keen, E.M.: Prospects for classification suggested by evaluation tests (1976)
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Keen, E.M.: On the generation and searching of entries in printed subject indexes (1977)
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Keen, E.M.: Presenting results of experimental retrieval comparisons (1992)
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Anderson, J.D.; Radford, G.: Back-of-the-book indexing with the nested phrase indexing system (NEPHIS) (1988)
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Nieuwenhuysen, P.: Development of slides about information retrieval : using a presentation software package (1995)
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Craven, T.C.: NEPHIS: a nested phrase indexing system (1977)
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Jensen, P.E.: Three methods of teaching basic subject cataloging (1985)
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Williams, D.A.: Information skills in the school curriculum (1991)
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