Digital National Security Archive provides access to declassified U.S. government documents from 1945-2013. Many of the documents were declassified and released in response to Freedom of Information Act requests and other efforts of the National Security Archive, a non-profit Washington DC-based activist organization dedicated to government transparency. The collection contains policy documents including presidential directives, memos, diplomatic dispatches, meeting notes, independent reports, briefing papers, White House communications, email, confidential letters and other previously classified and/or sensitive government-produced material.

Many of the documents were originally published in microformat through a partnership with Chadwyck-Healey, Inc. and made available for purchase. ProQuest Information and Learning Company partnered with the National Security Archive to digitize the collection and continue to add to it. As of August 2016 the resource included 48 collections consisting of approximately 120,000 indexed documents focusing on national security topics, such as the Cuban Missile Crisis, U.S. Intelligence after 9/11, and the Vietnam War.

A small subset of these documents is available in open access in the Electronic Briefing Books" on the website of the National Security Archive [4]. The latter include published ebooks, briefs, and reports produced by the staff of the National Security Archive dealing with current and historical topics related to the collections in the ProQuest database and about other projects, such as the Guatemala National Police Archives, in which the NSA has been involved. Many of the reports and briefs link to selected PDFs of original documents that are also included in the DNSA database, but are available gratis in the brief/report. 

To view titles and descriptions of the 48 collections available through the Digital National Security Archive, please visit the ProQuest LibGuide at: http://proquest.libguides.com/dnsa/collections [5].