Hynek presents his systematic classification of UAP encounters, arguing that a significant residue of unexplained reports exists that cannot be dismissed. Introduces the CE-1, CE-2, CE-3 taxonomy that has become standard in UAP research worldwide.

Hynek's foundational classification system - Close Encounter of the First, Second, and Third Kind - introduced here for the first time. Written after his years as Blue Book's official scientific consultant, this book represents his break from the debunking consensus toward a serious scientific position.

The UFO Experience: A Scientific Inquiry

Founded by J. Allen Hynek after his break with Project Blue Book. Maintains the UFOCAT cross-referenced database (one of the five sources in DECUR's sightings integration) and publishes the International UFO Reporter. The oldest continuously operating scientific UAP research organization in the United States.

CUFOS - J. Allen Hynek Center for UFO Studies

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