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In 1972, a massive number of government documents were declassified and released. In response, the Declassified Documents Reference System was created and originally published in print as the Declassified Documents Catalog. Entries in the catalog include a title or summary line, source agency, type of document, pagination, publication, security classification, “sanitized copy status,” and declassification date (see the “User’s Guide” in the front of each quarterly catalog for more information). A microfiche series accompanied the quarterly catalog. The majority of declassified documents are from the Central Intelligence Agency, State Department, and the Department of Defense. Other documents in the DDRS were generated by the National Security Council, White House, FBI, etc. Users accessing the contents of the DDRS will find correspondence, background studies, situation reports, meeting minutes, telegrams, national intelligence estimates, and unevaluated field reports