I also recall how great it was when Stan Lee started his series of ORIGINS OF MARVEL COMICS books.
In an era where the original stories, only 15 or 20 years old, were far harder to find. Very useful to have them collected in one volume.
I have ORIGINS OF MARVEL COMICS, SON OF ORIGINS, and BRING ON THE BAD GUYS.
There was a
fourth volume with Marvel's female characters that I never picked up.
But again, these origin stories are much more accessible and easy to find now.