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ONLINE PUBLIC ACCESS CATALOGUE (OPAC)
By late 1970s, libraries began to use computers for cataloguing purpose and the idea of making the catalogue of a library available to its users online began to be accepted and has been implemented in a number of libraries. This computerised online catalogue, which can he searched by the users directly for the retrieval of records without the assistance of a trained intermediary is commonly known as Online Public Access Catalgoue ((PAC).
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communication can bring about advancement in any society.
Cross Reference Index Entry Ranganathan in his Classified Catalogue Code uses the term, Cross Reference Index Entry for the type of entry that "usually directs the readers at
Professional Directories The past four decades have witnessed the growth of national, international, and local professional associations whereby scholars of a particular field
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Thesaurus in Post-Coordinate Indexing Systems Thesaurus has come into existence as a tool for vocabulary control in post-coordinated indexing system. It helps the indexer i
State Rawl 's principles? (1) Every person is entitled to the most extensive amount of liberty compatible with an equal amount for others. (2) Differences in social power
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