During the Great Depression, the WPA hired writers to collect oral histories from former slaves, who by this time ranged in age from their 70s to the 100s. This video is a student project using Slave Narratives that were gathered in from former slaves living in Missouri. Some of the writers wrote down the narratives phonetically based on the pronunciation of the former slave; others were recorded in standard English.
This video can also be accessed at http://www.youtube.com/watch?v=E68yahKvqH0
This is an excellent site to learn more about the Slave Narrative Project, and it contains transcripts of some of the oral histories that were collected: http://xroads.virginia.edu/~hyper/wpa/wpahome.html