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Bellardo, T.: Subject indexing : an introductory guide (1991)
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Satija, M.P.; Agrawal, S.P.: Book numbers : some indian methods (1990)
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Cleveland, D.B.; Cleveland, A.D.: Introduction to abstracting and indexing (1990)
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Fugmann, R.: Theoretische Grundlagen der Indexierungspraxis (1992)
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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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