This is a picture of Erle Stanley Gardner, author of more books than you can count, almost, including 82 Perry Mason (lawyer) novels.
I used to visit a friend’s house when I was in my teens and his mother had a bookshelf with a large collection of Mason novels. They were very impressive, if slim volumes. “The case of the…”
You can still get them, sometimes there is a new print of some titles, old paperbacks become available second hand and there was even a collected hardback edition some years ago. Anyway, I have read 63, so just 19 more to go. Of course, finding them gets harder, but Amazon is your friend.