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Information sources on the Internet

It is now possible to consult information sources essential to research work on-line. Some of the first information sources available over the Internet were major libraries' catalogues, to which significant bibliographies, directories and other institutions' archives were later added. Virtual libraries not only enable users to access bibliographic records, they also permit them to search and read complete texts. In order to facilitate users' searches over the Internet, we have selected a number of useful websites, which have been grouped by typology and subject.