I responded to Larry Schwartz directly, but let me repeat it here since Jeremy
suggested it.  There's a pricey publication titled "Film Superlist"--actually
several editions with that title listed in Books In Print.  We don't have it
and I have not had an opportunity to use it, but for p.d. films I understand
there's nothing like it.
 
Jeff Clark
Media Resource
James Madison Univ.