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"The Foreign Relations of the United States series presents the official documentary historical record of major U.S. foreign policy decisions and significant diplomatic activity. The series, which is produced by the State Department's Office of the Historian, began in 1861 and now comprises more than 450 individual volumes. The volumes published over the last two decades increasingly contain declassified records from all the foreign affairs agencies." (U.S. Department of State, Office of the Historian)
Declassified documents on U.S. foreign and military policy, diplomacy, human rights, and world events. Collections within DNSA include "U.S. Espionage and Intelligence, 1947-1996," "Afghanistan: The Making of U.S. Policy, 1973-1990," "Mexico-United States Counternarcotics Policy, 1969-2013," and many more. Coverage begins in 1945.
"National Security Archive Electronic Briefing Books provide online access to critical declassified records on issues including U.S. national security, foreign policy, diplomatic and military history, intelligence policy, and more. Updated frequently, the Electronic Briefing Books represent just a small sample of the documents in our published and unpublished collections." (The "published collections" are included in the Digital National Security Archive database linked above.)
U.S. Declassified Documents Online (formerly known as DDRS)
U.S. Declassified Documents Online, formerly known as Declassified Documents Reference System (DDRS) provides full-text declassified documents from U.S. government agencies, including the CIA, FBI, White House, State Department, and others. Document types include: correspondence, memoranda, minutes of cabinet meetings, technical studies, national security policy statements, and intelligence estimates.
Yale also has the DDRSmicrofiche set of declassified documents, which is searchable through a CD-ROM index (available at the Marx Science and Social Science Library). A print index is also available: 1975-1985, and 1986-2005. The CD-ROM and print indexes have the same content, so there is no need to search both indexes in order to locate documents in the microfiche set.
More declassified documents on the web
Declassified documents freely available on the web can be found at federal agencies' web sites (search the agency's site for "FOIA" or "electronic reading room"), from presidential libraries, research institutes, or other sites, sometimes presented by subject. Below are examples of such sites: