The collection very likely was all obtained through mailing to the various celebrities and sports figures. The baseball signatures at least all look like mid to late 1970s era ones you'd get back from them.
While I did try a few non-sports TTMs back in those days, I think that a lot of the movie stars, especially, were secretarial but I am by no means an expert on movie autographs and not passing any judgement on those the OP obtained.
Congratulations though, on a great find!
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