Old film footage for free use

Anybody know where I can get old film reel footage with no copyright? like old family 35mm footage in the public domain or old newsreels or infomercials that are free to use etc?

I have looked at

https://archive.org/
historicfilms.com

and they are good but not quite the length or have watermarks.

Thanks

https://inches-per-second.blogspot.com


It's mostly audio but I remember a few instances where he had video, or at least posted a link.



I don't know if it's still 75 years, but there's a certain point where it becomes public domain

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Why not just sample some film footage from known public domain movies?
https://en.wikipedia.org/wiki/List_o..._United_States

Thanks I'll check these out.

Thanks for the links, I will check them.