Check out Missing Movies, “an ad hoc group of film lovers and professionals, we have come together to create Missing Movies to empower filmmakers, distributors, archivists, and others to locate lost materials, clear rights, and advocate for policies and laws to make the full range of our cinema history available to all.” The group also includes a list of missing films at their site you. See it all here. And Indiewire has more here, including an interview with Nancy Savoca, a filmmaker and co-founder of Missing Movies.