Here you have all the books avaiable within the Isaac Asimov's Foundation universe.

It includes:
- Robot Series:
I, Robot (1950) and later collections of robot stories: The Complete Robot (1982), Robot Dreams (1986), and Robot Visions (1990).
The Positronic Man (1992)
The Caves of Steel (1954)
The Naked Sun (1957)
The Robots of Dawn (1983)
Robots and Empire (1985)
- Empire Series
The Stars, Like Dust (1951)
The Currents of Space (1952)
Pebble in the Sky (1950)
- Foundation Series
Prelude to Foundation (1988)
Forward the Foundation (1993)
Foundation (1951)
Foundation and Empire (1952)
Second Foundation (1953)
Foundation's Edge (1981)
Foundation and Earth (1986)
Also are included various sets of books related to the Foundation story or within the universe. It contains the following:
- Isaac Asimov's I, Robot by Mickey Zucker Reichert
- Isaac Asimov's Robots in Time by William F. Wu
- Isaac Asimov's Robot City by Various Authors
- Isaac Asimov's Robot Mystery by Mark W. Tiedemann and Alexander C. Irvine
- Caliban Series by Roger MacBride Allen
- Second Foundation Series by Gregory Benford, Greg Bear and David Brin
There's also a spanish version of most of the books. The ones I could find at least.
Enjoy.