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Other views: | Summary Awards Chronological |
Essays
- UFOs und grüne Männchen [German] (1997)
Non-Genre Titles
Nonfiction
- Das Atlantis-Rätsel [German] (1976)
- Das Bermuda-Dreieck: Fenster zum Kosmos? [German] (1975)
- De Bermuda Driehoek [Dutch] (1975)
- Doomsday, 1999 A.D. (1981)
- Geheimen van Verzonken Beschavingen [Dutch] (1978)
- Het Geheim van Atlantis [Dutch] (1976)
- Mysteries from Forgotten Worlds (1972)
- Sans trace [French] (1986) with J. Manson Valentine
- Spoorloos in de Bermuda Driehoek [Dutch] (1977)
- The Bermuda Triangle (1974)
- The Mystery of Atlantis (1969)
- Without a Trace (1977) with J. Manson Valentine