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There are quite a number of channels that offer older public domain movies. However, it's tough to say if any have those particular movies. I don't know of any way to find out other than to install them and look around.
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Thanks, Dan. I was afraid of that. I have probably 15 or so classic/older program channels and none have them. It would be great seeing "Francis the Talking Mule," too. Shame that one has to spend so much time looking. Seems that since it's all Roku, they could have some kind of search that might cover all of them. Again, Thanks