The Moon Men

From Author Wars - https://authorwars.com/publications/the-moon-men-248809.html

Overview:

Title: The Moon Men
Author: Edgar Rice Burroughs
Year: Unknown
Publisher: Ace Books
Price: $1.25
Pages: 222
Binding: Paperback
Type: Collection
Title Reference: The Red Hawk
Notes:
Copyright page has "This Ace edition follows the text of the original magazine novels published in 1925."
The illustration on the title page is not credited, has the initials RGK
The cover artist is not credited, no visible signature on the artwork