7 books in series

Bill, the Galactic Hero

Bill, the Galactic Hero is a 7-book series with 7 released primary works first released in 1965 with contributions by Harry Harrison and Robert Sheckley.

Bill, The Galactic Hero
Bill, The Galactic Hero On The Planet Of Robot Slaves
Bill, the Galactic Hero on the Planet of Bottled Brains
Bill, The Galactic Hero On the Planet of Tasteless Pleasure
Bill, The Galactic Hero On the Planet of Zombie Vampires
Bill, The Galactic Hero On the Planet of Ten Thousand Bars
Bill, The Galactic Hero The Final Incoherent Adventure