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Principles underlying subject heading languages (SHLs) (1999)
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- Working Group on Principles Underlying Subject Heading Languages; approved by the Standing Committee of the IFLA Section on Classification and Indexing.
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Subject indexing : principles and practices in the 90's. Proceedings of the IFLA Satellite Meeting Held in Lisbon, Portugal, 17-18 August 1993, and sponsored by the IFLA Section on Classification and Indexing and the Instituto da Biblioteca Nacional e do Livro, Lisbon, Portugal (1995)
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