The Howard Thurman & Sue Bailey Thurman Collections are held at the Howard Gotlieb Archival Research Center on the fifth floor of Mugar Memorial Library. To gain access to the papers, please submit a written request to the Howard Gotlieb Archival Research Center. Instructions can be found at http://archives.bu.edu/researchers.
You can search the collection or listen with the Virtual Listening Room on the collection's website: http://archives.bu.edu/web/howard-thurman/home.