Planet of the Small Men / Masters of Space

From Author Wars - https://authorwars.com/publications/planet-of-the-small-men--masters-of-space-485425.html

Overview:

Title: Planet of the Small Men / Masters of Space
Author: uncredited
Year: 2014
ISBN-10: 9781612872209
Publisher: Armchair Fiction
Price: $12.95
Pages: 232
Binding: Trade Paperback
Type: Omnibus
Title Reference: Planet of the Small Men
Notes: Data from Armchair Fiction as of 10/17/14. Front cover is the same as Thrilling Wonder Stories, April 1950 (which is uncredited [likely by {{A|Earle Bergey}}]) Back cover art credit from original appearance in If, November 1961