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Ensor, P.: User characteristics of keyword searching in an OPAC (1992)
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Schauder, C.: Library of Congress Subject Heading reference structures and OPACs (1991)
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Stover, M.; Grassian, E.: Toward an automated reference information system : Inmagic and the UCLA ready-reference information files (1989)
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Pirmann, C.: Tags in the catalogue : insights from a usability study of LibraryThing for libraries (2012)
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Borgman, C.L.; Hirsh, S.G.; Walter, V.A.; Gallagher, A.L.: Childrens searching behavior on browsing and keyword online catalogs : the Science Library Catalog project (1995)
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