These are examples of scholarly/academic Web sites which may be useful for overviews, excerpts, oral histories, and lists of resources. One tool you could use to find other such sites is OAIster, a University of Michigan project which now lists over 3 million freely-available, academically- oriented digital resources.
Companion site to the Library of America's volumes of the same title. Useful for information on authors and excerpts from their writings, as well as other documents and links.
Personal accounts, chronology, more. From the Library of Congress, the Leadership Conference on Civil Rights, and the American Association of Retired People.
The Thurgood Marshall Law Library at the University of Maryland has made available these digital copies of decades-old publications.
Doctoral dissertation from Louisiana State University.
Master's thesis from East Tennessee State University.