Probably has a very extensive method to discover these books. He's no ordinary man, he's smart and experienced enough he can research which books to read himsel

Probably has a very extensive method to discover these books. He's no ordinary man, he's smart and experienced enough he can research which books to read himself, he can't read everything, so he has to be very selective. He probably also has staff whose job is to find interesting books for him to read. Then add recommendations from friends and other people.