DOAJ is a gateway to open-access scholarly journals on the web. Journals cover all areas of science, technology, medicine, social science, humanities and law. To be included in the directory a journal must be available full text, free of charge and must be peer-reviewed or subject to editorial quality-control. Journals and their articles are classified using a Library of Congress tree structure that can be browsed or searched. There are currently 279 legal journals included in the directory.