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The increasing needs of the user communities, substantial increase in the cost of documents and the constraints of limited financial resources make it necessary for the librarians to design and develop need-based information systems and services to meet the information needs and requirements of users. A thorough knowledge of the characteristics of the subject literature required by the users is very important in planning and designing of such information systems and services. To tackle this, librarians have to use quantitative techniques effectively. In order to overcome these problems and to acquire a thorough understanding of the characteristics of the literature, the early 20th century documentalists applied mathematical and statistical techniques to bibliographical units. This has led to the emergence of a new branch of knowledge in the field of 'Library and Information Science known as 'Bibliometrics'. Bibliometrics is of recent origin and a relatively new area of study, which has emerged as a research field in its own right in information science.