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.

There are two components to DDRS:

• A microfiche set of declassified documents, which is searchable through a CD-ROM index (available at the Social Science library). A print index is also available. 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.
• A subset of the Declassified Documents microfiche set is available, online, for searching and retrieving scanned versions of the documents. More than 10,000 documents in the microfiche set are not included in the online system. To ensure a complete search, use the CD-ROM or print indexes, as described above.