The Green Hills of Earth and The Menace from Earth (Paperback)
Two of the Grand Master's finest:
The saga of the opening of the space frontier as courageous men and women risked their lives to build the first space station and colonize the Moon and Venus, while praying for one last landing on the globe that gave them birth, to return to The Green Hills of Earth.
From a mysterious region on Earth, where a more advanced lifeform may be studying the interesting creatures called "humans", to the first moon colony, where a young girl's relationship with her boyfriend is endangered by the beautiful Menace from Earth.
Classic Heinlein, in a new Omni-trade format package.