A PDF-based collection of law review articles and a wide variety of other legal materials. The service is best known for its Law Journal Library which contains back runs of more than 1,100 journal titles, in most cases beginning with the first issue of each journal. HeinOnline's coverage has expanded to include archival libraries of federal and state primary law, federal legislative histories, U.S. treaties, foreign and international law sources, and classic American law treatises. Coverage continues to expand. Each library is full-text searchable, and search results are PDF files that can be printed and downloaded.