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Bertolucci, K.: Happiness is taxonomy : four structures for Snoopy - libraries' method of categorizing and classification (2003)
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Hanken, J.: Organizing the world in the age of DNA (2007)
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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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Classification Research Group: ¬The need for a faceted classification as the basis of all methods of information retrieval (1985)
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