HeinOnline This link opens in a new windowHeinOnline is a searchable digital (PDFs) collection of law and law-related materials. They include Pentagon Papers, Session Laws Library, State Statutes: A Historical Archive, U.S. Code (from 1925), U.S. Congressional Documents (from 1780s), U.S. Federal Legislative History Library, U.S. Presidential Library, U.S. Statutes at Large (from the 1780s), U.S. Supreme Court Library, and more.