It's been a while since I have listened to them, but there's a sequence on the Scopes trial that includes both Darrow and Bryan on Volume III of the Edward R. Murrow - Fred Friendly "I Can Hear It Now" series (Columbia ML 4340). Much of the material on those records was recreated for the records, and a lot of the early material was recorded by actors. I don't know if the Darrow stuff is himself or not, but you might be able to use it anyway with a disclaimer.
Does anyone know of any recordings of Clarence Darrow of Scopes Monkey Trial fame? Thank you.
Voice of America Washington, D.C.