HeinOnline HeinOnline is a comprehensive law database. Collections include: the Law Journal Library, incl. The database Most-Cited Law Journals, the Federal Register Library, the Treaties and Agreements Library, and the U.S. Supreme Court Library, as well as European Center for Minority Issues, Legal Classics, U.S. Federal Legislative Histories Library, U.S. Attorney General Opinions and U.S. Statutes at Large.