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Studwell, W.E.: Subject suggestions 7 : some concerns relating to the social sciences (1990)
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Rolland-Thomas, P.: Thesaural codes : an appraisal of their use in the Library of Congress Subject Headings (1993)
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Palmer, J.W.: Subject authority control and syndetic structure - myth and realities : an inquiry into certain subject heading practices and some questions about their implications (1986)
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