This is a good reference to use when researching African American cemeteries in Harris County. This is an online abstract from the book:

Beverly, Trevia Wooster. At Rest: A Historical Directory of Harris County, Texas, Cemeteries (1822-2001) Including Burial Customs and Other Interesting Facts, With a Listing of Past and Present Communities, Funeral Home and Monument Companies. 2nd Edition: From 370 to 509 cross-indexed listings. (Tejas Publications & Research, Houston, 2001).