The Department of Special Collections and University Archives at Vanderbilt University has recently created a fascinating digital archive of primary sources compiled by Robert Penn Warren for his 1965 book "Who Speaks for the Negro?"
Closer to home, Stanford's Department of Special Collections, University Archives, and the Archive of Recorded Sound hold a similarly fascinating collection of interviews (known as the "KZSU Project South interviews") with Civil Rights workers, recorded in 1965 by Stanford students affiliated with campus radio station KZSU.