An extensive collection of documents, chronologies, essays, and images are available on this site dedicated to Berkeley’s Free Speech Movement.
This site nicely recounts Flood’s challenge to Major League Baseball’s reserve clause. There are no documents or downloadable images, but there is a list of recommended reading.
The Miller Center of Public Affairs at the University of Virginia maintains a website devoted to the history of the presidency. Biographies of all the presidents and essays on the “president at work” are available. Materials acquired through an oral history project focusing on the key figures within all of the administrations since Jimmy Carter are also accessible here. And a collection of presidential recordings dating to Herbert Hoover’s term can be downloaded; transcripts of these recordings are also available.