Um... ouch. Why Robert Heinlein?
who sincerely hopes you don't mean the the universes of Universal Soldier. Stranger in a Strange Land, any of the Lazarus Long books, Door into Summer, Glory Road, or that awful metauniverse crossover Number of the Beast.
Heinlein Free for over 4 years!
Manon, Orado, etc.
Denton, never leave home without it.