A Heinlein Trio: The Puppet Masters, Double Star, The Door Into Summer

Farnham's Freehold

To The Stars; (4 in 1) Between Planets, The Rolling Stones, Starman Jones, The Star Beast

The Moon Is a Harsh Mistress

Infinite Possibilities (Tunnel In the Sky; Time For the Stars; Citizen of the Galaxy)

Off the Main Sequence: The Other Science Fiction Stories of Robert A. Heinlein