A library catalogue is a register of all bibliographic items found in a particular library or group of libraries, such as those belonging to a university system spread out over several geographic locations. A bibliographic item can be any information entity (e.g., books, computer files, graphics, realia. carlographic materials, etc.), that is considered library material (.e.g., a single novel in an anthology) or a group of library materials (e.g., a trilogy) or linked from the catalogue (e.g., a webpage) as far as it is relevant to the catalogue and to the users (patrons) of the library. This book includes comprehensive cataloguing and catalogue management resources on the lnternet. General resources contain some major cataloguing resources on Internet such as LC services and some selective comprehensive resources for cataloguing. The Cataloguer''s Reference Shelf, a component of the help systems in ITS for Windows and the Library. Solution integrated online library system, has recently been published in web format and is available for free use by any cataloguer with a web browser. The CRS is a collection of 21 MARC manuals and other reference works frequently accessed by technical services staff. In this context the entire work related to various technologies is divided into several chapters. An attempt has been made to identify the impact of electronic media in modern libraries and information centres in the context of the information age in new millennium..