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Types of Thesauri
Based on the nature of terminology control, there are mainly two types of thesauri:
a) controlled thesauri which allow only one term (preferred term) to denote a concept for the purpose of indexing and searching; and
b) free language thesauri, which allow use of all terms to denote a concept to be used for indexing and searching.
The controlled thesauri can be maintained manually but free language thesauri require machine maintenance and retrieval.
Advantages Duplication of work can be avoided. Cost of cataloguing can be minimised. Uniform and standard cataloguing' practices can be adopted. Cataloguing ca
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storage and retrieval
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Audio-Visual Media Sometimes information cannot be conveyed by words alone. Librarian:, hive extensively made use of the audio and visual form the new technology to their a
SUBJECT AUTHORITY FILE Meaning Most libraries maintain a subject authority file consisting of subject authority records in order to ensure uniformity and consistency
Analytical Entries Sometimes we may wish to draw the attention of a library user to a part or parts of a book which we feel may otherwise escape the attention of the user. A
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