Photographer and blogger Raul Gutierrez says, "Square America has posted an online show titled African-American Portraits & Snapshots, a collection of 160 photographs taken between 1900 to 1975 (several home movies are also included)."
Link (be patient, the site is designed simply and not optimized well, and takes a while to load).
Below, one of the "beautifully abstract" home movies included in Square America's online gallery — which may end up being a book someday. I sure hope so.