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- Hidden realms, lost civilizations, and beings from other worlds, Jerome Clark
- Encyclopedia of strange and unexplained physical phenomena, Jerome Clark
- Clark, Jerome, UFO encyclopedia, v. 1
- Unexplained!, strange sightings, incredible occurrences, and puzzling physical phenomena, by Jerome Clark
- The UFO encyclopedia, the phenomenon from the beginning, by Jerome Clark
- UFOs in the 1980s, by Jerome Clark