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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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Henderson, K.L.; Piggott, M.: Mary Piggott : a long long-distance friendship (1998)
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Foskett, D.J.: Concerning general and special classifications (1991)
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Foskett, D.J.: Classification and integrative levels (1985)
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Austin, D.; Digger, J.A.: PRECIS: The Preserved Context Index System (1985)
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