Maybe deconstructing old magnetic photo albums?
Or some type of "photo archival" group that deals with that type of process?
I have never done anything like that. If the photos are all out of the album, I'd think even just cutting the plastic off and cover the bit that's left?
I did a quick search on Google and found these:
https://www.picturethisorganized.com...-photo-albums/
https://goodlifephotosolutions.com/m...-photo-albums/