Downward to the Earth Robert Silverberg Downward to the Earth Robert Silverberg · 1976 First published 3 years earlier Save Continue from here
Imperial Earth Arthur C. Clarke Imperial Earth Arthur C. Clarke · 1975 First published 4 years earlier Save Continue from here
The Vanishing Tower Michael Moorcock The Vanishing Tower Michael Moorcock · 1971 First published 8 years earlier Save Continue from here
