Annalee Newitz used to teach literature and American Studies at UC Berkeley and composed a list of the Sci-Fi books that she considers the Must-Read’s of Sci-Fi.
The nice thing about this list is that the books are sorted by major themes within the genre and that she linked most of them to free versions you can get online.

Genre Foundations
- Frankenstein, Mary Shelley
- The Time Machine, H. G. Wells
- A Princess of Mars, Edgar Rice Burroughs
- “At the Mountains of Madness,” H.P. Lovecraft
Utopias and Dystopias
- Herland, Charlotte Perkins Gilman
- Brave New World, Aldous Huxley
- 1984, George Orwell
- The Man In the High Castle, Philip K. Dick
- The Female Man, Joanna Russ
Robots
- I, Robot, by Isaac Asimov
- Neuromancer, by William Gibson
- Saturn’s Children, by Charles Stross
Aliens
- “Who Goes There,” John W. Campbell
- Lilith’s Brood, by Octavia Butler
- The Secret City, by Carol Emschwiller
Space Travel
- Triplanetary, E.E. “Doc” Smith
- Downbelow Station, C.J. Cherryh
- The Sparrow, Maria Doria Russell
- Consider Phlebas, Iain M. Banks
Science Fiction as Political Philosophy
- Orlando, Virgina Woolf
- Stranger In A Strange Land, Robert Heinlein
- Dhalgren, Samuel Delaney
- The Dispossessed, Ursula LeGuin
- Anathem, Neal Stephenson
Now have a look at the full list, and head over to Amazon, as I’m sure that, like me, there are quite some books that you did not read yet!
(Source: io9.com)
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@Chrisstheninja Would you buy me the book about HQ Bank by Caroline Neurath? Or Rapture by John Shilery? I want Fantasy&Sci-Fi.