J. Allen Hynek
![](https://upload.wikimedia.org/wikipedia/commons/0/08/Allen_Hynek.jpg)
In later years, he conducted his own independent UFO research, developing the "Close Encounter" classification system. He was among the first people to conduct scientific analysis of reports and especially of trace evidence purportedly left by UFOs. Provided by Wikipedia
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Published: 1957
Superior document: Reprints / The Astronomical Observatory of Harvard College : Series II 111