The 13th Immortal / This Fortress World
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Overview:
- Title: The 13th Immortal / This Fortress World
- Author: Robert Silverberg, James E. Gunn
- Year: 1957
- Publisher: Ace Books
- Price: $0.35
- Pages: 129+190
- Binding: dos
- Type: Omnibus
- Title Reference: This Fortress World
- Notes:
• The 13th Immortal is 129 pages. ©1957- • The cover has "Complete Novel".
• The artist is not credited; no visible signature; ACE Image Library credits Valigursky
- • The cover has "abridged".
• The artist is not credited; EMSH is on the artwork