And of course Fahrenheit 451 (1953).
I cut my sci-fi teeth on Jules Verne's
20,000 Leagues Under the Sea, and HG Wells'
War of the Worlds and
The Time Machine. After that, Asimov's short stories (
I Robot, Nightfall) then
The Foundation Trilogy, Bradbury's
The Martian Chronicles, Edgar Rice Burroughs' Barsoom books, Heinlein's
The Moon is a Harsh Mistress, and almost anything by Robert E. Howard and H.P. Lovecraft.
Tolkein landed in there somewhere, but I never considered the Lord of the Rings to be Sci-fi, nor CS Lewis' Chronicles of Narnia, for some reason. Crighton's
The Andromeda Strain and Clarke's
2001: A Space Odyssey followed.
From there it was off to the races with Herbert's
The Eyes of Heisenberg, Dune (The trilogy, but the first book is best) and then discovered Bean Books, with John Ringo, David Weber, and others...I'm still catching up.