HeinOnline HeinOnline is an online database containing more than 270,000 titles of historical and government documents in a fully searchable, image-based format. HeinOnline bridges an important research gap by providing comprehensive coverage from the inception of more than 2,700 law-related periodicals. In addition, HeinOnline contains the entire Congressional Record, Federal Register, and Code of Federal Regulations, complete coverage of the U.S. Reports back to 1754, and entire databases dedicated to treaties, constitutions, case law, world trials, classic treatises, international trade, foreign relations, U.S. Presidents, and much more.