The Citadel in Space

From Author Wars - https://authorwars.com/books/the-citadel-in-space-1728537.html

Overview:

Title: The Citadel in Space
Author: Neil R. Jones
Year: 1951
Type: Novels
Series: Durna Rangue
Number in Series: 9

Variant Titles:

1951. The Citadel in Space (Complete Novel)