The following websites provide access to many of the NSA documents leaked by Edward Snowden beginning in 2013. Many of these documents are not yet declassified.

The following websites provide access to documents published by WikiLeaks. Many of these documents are not yet declassified.

The Pentagon Papers, officially titled "Report of the Office of the Secretary of Defense Vietnam Task Force", was commissioned by Secretary of Defense Robert McNamara in 1967.

This classified report was leaked to the media in 1971 by Daniel Ellsberg. It was finally declassified in 2011, when the National Archives and Records Administration released the complete text of the report for the first time.

Produced by the State Department's Office of the Historian, Foreign Relations of the United States is the official documentary historical record of major U.S. foreign policy decisions that have been declassified and edited for publication.

Many of the Presidential Libraries, administered by the Office of Presidential Libraries under the National Archives and Records Administration, provide access to scanned, declassified documents.

Since its inception in 1966,the Freedom of Information Act has required federal agencies to make certain categories of records"available for public inspection and copying." Subsequently, the Electronic Freedom of Information Act Amendments of 1996 required the creation of virtual reading rooms, accessible through the Internet.