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Computerised Information Services
Having understood the basic aspects of information retrieval, let us try to understand the nature of computerised information, services: Computer-based information services can conveniently be studied under the following heads:
i) Current Awareness Services
ii) Printed Indexes
iii) Online Search Services
iv) Document Delivery Services
v) CD-ROM Database Products and Services
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Printed indexes One of the first applications of the computer to information retrieval was in the production of printed indexes. Computers were used, both for the preparation
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