Avatar_Emil said: IT DOES? How do you know that? I was under the impression that the 75th anniversary Blu-ray DIDN'T have mono. Also, according to this, there was a DVD release which did have mono, if not two.
This article on bluray.com on the release does confirm a mono mix.
http://www.blu-ray.com/movies/The-Wizard-of-Oz-3D-Blu-ray/72226/#Review