The Federation Series

From Author Wars - https://authorwars.com/publications/the-federation-series-852858.html

Overview:

Title: The Federation Series
Author: H. Beam Piper
Year: 2010
Publisher: Halcyon Press
Price: $1.99
Binding: ebook
Type: Omnibus
Title Reference: Four-Day Planet
Notes:
Date from Amazon.com on 2021-08-19. Amazon Kindle page count 437. Publisher is not credited but is assumed based on the series name. No copyright page.