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From the Miller Center at the University of Virginia, a nonpartisan institute "that seeks to expand understanding of the presidency, policy, and political history, providing critical insights for the nation’s governance challenges." For each president includes essays, speeches, bibliographies, links to presidential papers, and information on access to private and public papers.
University of California, Santa Barbara project. Digital archive of over 102,300 documents relating to the U.S. Presidency, including the Papers of the Presidents, inaugural and State of the Union addresses, transcripts and videos of presidential debates, transcripts of campaign speeches, news conferences, etc.
"The Library's holdings include the papers of John F. Kennedy, Robert F. Kennedy, Joseph P. Kennedy, and Rose Kennedy, as well as close to 400 other collections: those of Kennedy family members, Kennedy administration officials and associates, and pertinent individuals, authors, and institutions. The John F. Kennedy Library also houses the Ernest Hemingway Collection and the John F. Kennedy and Robert F. Kennedy Oral History Collections."
National Archives collection of more than 5 million pages of assassination-related records, photographs, motion pictures, sound recordings and artifacts (approximately 2,000 cubic feet of records). The collection is partially indexed by the JFK Database although most of these records are not available online.
National Security Archive Electronic Briefing Book Number 48. Audio and transcripts of telephone and meeting conversations detailing reactions of President Nixon and his aides to the release of the Pentagon Papers; arguments and briefs of the resulting Supreme Court case; the secret briefs and evidence submited to the Court; and the Supreme Court decision.
Watergate: A Brief History with Documents.
Stanley I. Kutler. 2nd ed. Malden, MA, Wiley-Blackwell, 2010. Available?
"Current holdings include 25 million pages of memos, letters, meeting notes, reports, and other historical documents. Also there are one-half million audiovisual items, including photographs, videotapes of news broadcasts, audiotapes of speeches and press briefings, film of public events, and televised campaign commercials. The 1974-77 presidential papers of Gerald Ford and his White House staff form the core collection. These are supplemented by the pre- and post-presidential papers of Gerald Ford, the papers of Betty Ford, collections of Federal records, and more."