Space Captain / The Mad Metropolis

From Author Wars - https://authorwars.com/publications/space-captain--the-mad-metropolis-43476.html

Overview:

Title: Space Captain / The Mad Metropolis
Author: Philip E. High, Murray Leinster
Year: 1966
Publisher: Ace Books
Price: $0.45
Pages: 142+112
Binding: dos
Type: Omnibus
Title Reference: Space Captain
Notes:
- Cover for Space Captain is stated "First Book Publication"
  - Space Captain is 112 pages
- Cover for The Mad Metropolis is stated "Complete Novel"
  - The Mad Metropolis is 142 pages
- Cover artists are not credited and signatures are not visible for both titles.
- ACE Image Library credits Gaughan with The Mad Metropolis and Morrow with Space Captain.
- Neither interior art piece is credited; one has Gaughan's "JG" on it.