In 1955, Morris K. Jessup achieved some notoriety with his book The Case for the UFO, in which he argued that UFOs represented a mysterious subject worthy of further study. Jessup speculated that UFOs were "exploratory craft of 'solid' and 'nebulous' character."David Richie, UFO: The Definitive Guide to Unidentified Flying Objects and Related Phenomena, (New York: Facts on File, 1994), p. 116. Jessup also "linked ancient monuments with prehistoric superscience".Clark, p. 210.
In 1955, Morris K. Jessup achieved some notoriety with his book The Case for the UFO, in which he: argued that UFOs represented a mysterious subject worthy of further study. Jessup speculated that UFOs were "exploratory craft of 'solid' and 'nebulous' character."David Richie, UFO The Definitive Guide to Unidentified Flying Objects and Related Phenomena, (New York: Facts on File, 1994), p. 116. Jessup also "linked ancient monuments with prehistoric superscience".Clark, p. 210.