These are great resources, but be sure to also look at the databases lisetd in the disciplinary library guides in the box to the left of this one. Rememeber these resources may give you access to primary sources (i.e. particular slave narratives or interviews) but they will probably mostly be articles that look at slavery, slave narratives, etc. through an academic, disciplinary lens - this may (depending on your assignment) be valuable when you are analysing your narratives.
"...a database containing comprehensive indexing of the most popular general-interest periodicals published in the United States and reflects the history of 20th century America. Covers periodicals published between 1890 and 1982."