When Clarke wrote this volume in 1968, humanity stood on the brink of bursting forth from this ball of dirt into the universe. It is full of hope for the Space Age to come, and a rather sad thing to read today. Still, it's a great book, crammed with technical diagrams, astronomical photographs, and good solid science.
1968 : UK Hardback
January 1985 : USA Mass Market Paperback
September 1970 : UK Paperback
1970 : USA Mass Market Paperback
Title: The Promise of Space
Author(s): Arthur C Clarke
ISBN: 0-515-02157-1 / 978-0-515-02157-8 (USA edition)