The INIS Reference Series defines the rules, standards, formats, codes and authority lists on which the International Nuclear Information System is based. Over the years most manuals have been revised or merged, and further revisions will be issued in the future. The series consists of 10 current manuals, all of which are available in print, on microfiche and many in electronic form, as described below.This manual describes the INIS Database, which is available on the IAEA's World Wide Web site, in order to assist the user in searching and retrieving relevant records. The manual is also available for registered users at the welcome page of the INIS Database web site. The INIS Database, covering all aspects of the peaceful applications of nuclear science and technology, is a bibliographical database containing over 2.3 million references with abstracts in English ranging from 1970 to the present. Starting from 1992, INIS also covers the economic and environmental aspects of all non-nuclear energy sources.