How many of these writers do you have on your shelves?

We're talking about books disappearing: books originally printed only in paperback—and books that are no longer in issue. I'm going to be listing, among others, people I knew personally, and series I'd expect an sf fan to have read, or looked at, or have some familiarity with.
Let's start with:
Clifford "Cliff" Simak: City.
Gordon R "Gordie" Dickson. The Dorsai stories.
Hal Clement. Mission of Gravity
Lin Carter. Sword and sorcery…from the Old School.
Poul Anderson: many, many, from SF to...