I've found many interesting historical sources of genealogical value on HathiTrust such as the Colored Methodist Episcopal conference minutes which enabled me to find valuable information relating to my own Methodist ancestors. Recently, I came across the book, "
History of Louisiana Negro Baptists from 1804 to 1914" by William Hicks. This particular work provides a detailed history of all the African-American Baptist churches and organizations that existed in Louisiana from statehood to the first decade of the 20th century. One can find the names of ministers as well as the detailed biographies of clergymen[many of them former slaves]. There is also information about the founding of Educational institutions and photographs. Sometimes, the most valuable information lies in non-traditional sources.
https://babel.hathitrust.org/cgi/pt?id=emu.010000426979;view=1up;seq=7
RS