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Preserved Context Index System (PRECIS)
PRECIS (Preserved Context Index System) was designed and developed by Derek Austin by about 1970 as an alternative procedure for deriving the subject headings and subject index entries for British National Bibliography (BNB). Since 1952, for nearly 20 years, BNB followed chain procedure for deriving subject index entries. Two most important factors worked for the development of PRECIS: I) Idea of replacing chain indexing technique of BNB; and ii) the decision of the British Library to generate computer produced BNB with all the indexes in view of launching the UKMARC project. Accordingly, a research project for a suitable alternative for generating subject indexes directly from the machine readable records were undertaken by the British Library with the following objectives, which, ultimately resulted in the development of PRECIS:
The Tang State Northern Wei 4 th to 6 th century. Semi-nomadic rulers initiated the process towards unification, not rulers in the south. Domestic management patterns: str
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The important information that needs to be obtained from the laboratory studies will enable us to evaluate if it is possible to reproduce the process in the larger scale vessel. In
Cataloguing-in-Source With the collaboration of the publishers and through a financial grant provided by the Council on Library Resources, the Library of Congress experimente
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Practical Handbooks Handbooks and manuals providing specific instructions or clear directions to do, to make, to operate, to learn, to do specialised jobs are known as practic
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TYPES OF BIBLIOGRAPHY Bibliographies are regarded as most important tools in libraries and documentation centers. This is due to the fact that they allow free flow of bibliogr
Use The indexes are the mainstay of I & A periodicals. Without them, consultation would be difficult and uncertain. After making up your mind about a specific approach, you sh
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