Siege of the Unseen / The World Swappers
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Overview:
- Title: Siege of the Unseen / The World Swappers
- Author: A. E. van Vogt, John Brunner
- Year: 1959
- Publisher: Ace Books
- Price: $0.35
- Pages: 103+153
- Binding: dos
- Type: Omnibus
- Title Reference: The World Swappers
- Notes:
- Cover for Siege of the Unseen has "Complete Novel"; 103 pages
- Cover for The World Swappers has "First Book Publication"; 153 pages
- Cover art for both titles is not credited and there are no visible signatures. ACE Image Library credits Valigursky with Siege of the Unseen
- Month of publication from Jad Smith's John Brunner biography