When They Come from Space

From Author Wars - https://authorwars.com/publications/when-they-come-from-space-211485.html

Overview:

Title: When They Come from Space
Author: Mark Clifton
Year: 1967
Publisher: Macfadden Books
Price: $0.50
Pages: 144
Binding: Paperback
Type: Novel
Title Reference: When They Come from Space
Notes:
- "First printing ..... January, 1963"
- "Second printing.....January, 1967"; no number line
- The artist is not credited, a partial signature is visible on the artwork
- Printed in the US