U.S. Declassified Documents Online provides immediate access to a broad range of previously classified federal records spanning the twentieth and twenty-first centuries. It is the most comprehensive compilation of declassified documents from the executive branch. The types of materials include intelligence studies, policy papers, diplomatic correspondence, cabinet meeting minutes, briefing materials, and domestic surveillance and military reports. The collection editors have actively monitored the release of formerly classified documents from presidential libraries. They have also added numerous major releases of declassified documents from the Department of State, Department of Defense, Central Intelligence Agency, Federal Bureau of Investigation, Joint Chiefs of Staff, and other executive agencies.