The Doomsday Planet

From Author Wars - https://authorwars.com/publications/the-doomsday-planet-559535.html

Overview:

Title: The Doomsday Planet
Author: Harl Vincent
Year: 1968
Publisher: Tower Books
Price: C$0.50
Pages: 141
Binding: Paperback
Type: Novel
Title Reference: The Doomsday Planet
Notes:
• "Second Printing: March, 1968"; no number line • The artist is not credited, no visible signature on the artwork • Cover printed in the US, book in Canada