Great reminder! Added!
(also added everything we could find written by each of the horsemen themselves. Some of our favorite authors, but we didn't have everything)
Sam: https://whitepaperbooks.com/search?q=sam+harris&options%5Bprefix%5D=last
Hitch: https://whitepaperbooks.com/search?q=christopher+hitchens&options%5Bprefix%5D=last
Dawkins: https://whitepaperbooks.com/search?q=richard+dawkins&options%5Bprefix%5D=last
Dennett: https://whitepaperbooks.com/search?q=dennett&options%5Bprefix%5D=last
;)