The green hills of Earth : and, The menace from Earth

Two of the Grand Master's finest! The Green Hills of Earth is thesaga of the opening of the space frontier as courageous men and women risk theirlives to build the first space station and colonize the Moon and Venus, whilepraying for one last landing on the globe that gave them birth.

Then, Menacefrom Earth takes readers from a mysterious region on Earth where a moreadvanced lifeform is tudying the interesting creatures called "humans", to thefirst moon colony, where a young girl's relationship with her boyfriend isendangered by the beautiful Menace from Earth.