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    Sources and how cases were chosen

    The selection of cases follows mainly the case chronologies of NICAP (National Investigations Committee on Aerial Phenomena; see also its chronologies and “Good Cases” files). Wikipedia’s List of reported UFO sightings was used only to fill gaps after 2000. Both are treated as selection guides, not as evidence: each entry’s facts were checked against primary records where possible (Project Blue Book, the Condon Report, FBI Vault, CIA, ODNI, AARO, NASA, congressional records, The Black Vault) or against my own library. “Library verdict” lines reflect my own assessments.

    Type tags: sighting · radar-visual · photo · physical trace · abduction claim · official. Summaries are neutral and do not imply that any case is unexplained unless stated.