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Classification research for knowledge representation and organization : Proc. of the 5th Int. Study Conf. on Classification Research, Toronto, Canada, 24.-28.6.1991 (1992)
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Classification research : Proc. of the 2nd Int. Study Conf. ... Elsinore, Denmark, 14.-18.9.1964 (1965)
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Universal classification II : Subject analysis and ordering systems. Proc. 4th Int. Study Conf. on Classification Research, 6th Annual Conf. of Gesellschaft für Klassifikation, Augsburg, 28.6.-2.7.1982 (1983)
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Universal classification I : subject analysis and ordering systems. Proc. 4th Int. Study Conf. on Classification Research, 6th Annual Conf. of Gesellschaft für Klassifikation, Augsburg, 28.6.-2.7.1982 (1982)
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Ordering systems for global information networks : Proc. of the 3rd Int. Study Conf. on Classification Research, Bombay, 1975 (1979)
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