Periodical indexes can help you broaden the scope of your search beyond what is covered in Westlaw, Lexis, and HeinOnline Law Journal Library. Indexes cover more journals, over a more extended period of time. Indexes also provide more sophisticated search functions, such as searching by subject, country of publication, and language. For international human rights law research, the Index to Foreign Legal Periodicals may be especially helpful because it covers hundreds of journals published worldwide in multiple languages.