13 books in series

Childe Cycle

Childe Cycle is a 13-book series with 13 primary works first released in 1960 with contributions by Gordon R. Dickson and David W. Wixon.

Dorsai
Negromante
Soldato non chiedere
Soldier, Ask Not
Tactics of Mistake
Spirit of Dorsai
Lost Dorsai
The Final Encyclopedia
L'Enciclopedia Finale - 1º
The Final Encyclopedia, 2 of 2
L'Enciclopedia Finale - 2°
La congiura Dorsai
Young Bleys
Antagonist
The Star Road