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Listed below are key databases that provide access to declassified primary documents, primarily from the U.S. government. Use these to obtain original materials that reflect actions of espionage and intelligence gathering.
Declassified Documents Reference System -- provides full text access to formerly classified U.S. government documents emanating from a wide variety of government agencies, including the CIA, Department of State, National Security Council, Department of Defense, FBI, etc.
Digital National Security Archive -- full-text of twelve collections of primary U.S. government documents which detail its foreign relations and chronicle policy decisions. Most documents were originally classified as top secret.
Descriptions of resources are adapted or quoted from vendor websites.