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Collison, R.: Indexing books : a manual of basic principles (1962)
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Mills, J.: ¬A modern outline of library classification (1960)
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Palmer, B.I.; Wells, J.: ¬The fundamentals of library classification (1961)
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Jonker, F.: Indexing theory, indexing methods, and search devices (1964)
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Ranganathan, S.R.; Gopinath, M.A.: Prolegomena to library classification (1967)
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