But then, the next book:
Robots and Empire is part of Asimov's consolidation of his three major series of science fiction stories and novels into a single future history: his Robot series, his Galactic Empire series and his Foundation series. (Asimov also carried out this unification in Foundation's Edge and its sequel.)But again If you have to describe the total works of Asimov's future history, you have to consider Heinlein's major works.
Asimov was my favorite when I was a teenager...