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| Other views: | Summary Awards Alphabetical |
Essays
- UFOs und grüne Männchen [German] (1997)
Non-Genre Titles
Nonfiction
- The Mystery of Atlantis (1969)
- Mysteries from Forgotten Worlds (1972)
- The Bermuda Triangle (1974)
- Without a Trace (1977) with J. Manson Valentine
- Doomsday, 1999 A.D. (1981)
