A reminder that if the set is in its original state, the sleeves are or were glassine. I might do research on removing glassine debris from vinyl. In my experience I've never seen glassine sleeves damage vinyl, in fact I think it makes a very good sleeve, but perhaps under less than ideal storage conditions it could adhere to the record.
Good find though, if you can clean it up
Good find though, if you can clean it up