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Chan, L.M.; Hodges, T.: Subject cataloguing and classification : the late 1980s and beyond (1990)
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Williamson, N.J.: Standards and rules for subject access (1996)
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Drabenstott, K.M.: Experiences with online catalogs in the USA using a classification system as a subject searching tool (1990)
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Fattahi, R.: ¬A uniform approach to the indexing of cataloguing data in online library systems (1997)
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