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Bloomfield, M.: ¬A look at subject headings : a plea for standardization (1993)
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Austin, D.; Digger, J.A.: PRECIS: The Preserved Context Index System (1985)
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Austin, D.: PRECIS (2009)
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Weintraub, D.K.: ¬An extended review of PRECIS (1979)
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Bakewell, K.G.B.: Indexers' reactions to PRECIS (1979)
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