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Studwell, W.E.: Subject suggestions 1 : some concerns relating to geographic areas (1988)
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Otchere, F.F.: African studies thesaurus : subject headings for library uses (1992)
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Williamson, N.J.: Subject cataloguing and LCSH (1991)
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Dailey, J.E.: Subject headings (1980)
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Collantes, L.Y.: Degree of agreement in naming objects and concepts for information retrieval (1995)
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