Adaptation
Mack Reynolds
United Planets (1)
Planetary Agent X
The Rival Rigelians and Planetary Agent X
Dawnman Planet
United Planets (2)
The Rival Rigelians
United Planets (3)
Code Duello
United Planets (4)
Amazon Planet
United Planets (5)
Section G: United Planets
United Planets (6)
Brain World
United Planets (7)