David Vassar Taylor, was the dean of the General College at the University of Minnesota, and a scholar of the African diaspora. He wrote and lectured on the history of African Americans in Minnesota, and worked in the project "Voices of Rondo: Oral Histories of Saint Paul’s Historic Black Community."
Nearly 50 years old, this is obviously a quite dated bibliography, nevertheless, it does provide a good starting point for some of the older sources, and in fact, by tracing citations, can be a useful entry into more contemporary work as well. In addition to published print sources, it also includes a listing of "Manuscript Collections" throughout Minnesota, as well as "Letters," "Personal Papers," "Buildings," "Photographs," and dozens of "Oral Interviews."