- Most works by Heinlein esp. The Moon Is A Harsh Mistress, Tunnel In The Sky, Time Enough For Love

- Many other works by Asimov

- The Rama series by A.C. Clarke

- Gateway and other novels in the same universe, by Fred Pohl

- The earlier novels of James P. Hogan esp. The Two Faces Of Tomorrow and The Genesis Machine

- The Complete Venus Equilateral, by George O. Smith

Much more, of course, but a good start.