Most of Henry Brown Richardson's family papers are archived at the Hill Memorial Library at Louisiana State University, Baton Rouge shown in the gallery below. The LSU campus is one of the most beautiful I've seen. Its giant oaks with their drooping limbs and moss is like a Louisiana dream. If you have a long research project, you can stay overnight at the Faculty Club. The lunches there are excellent and not expensive.
One of the photos shows some of Henry's descendants in a conference room at the Hill Library as they prepare to donate some more papers.
There are also a few of Henry's papers at the University of North Carolina at Chapel Hill.