Note B — Chapter III · AIR-BORNE UFOS: BALLOONS TO BUBBLES
Reading edition
A “classic” in the literature of flying saucers is a particularly dramatic UFO incident whose specific cause has not yet been found or, if found, cannot be absolutely proved from the evidence available. Lacking a completely airtight explanation, official investigators classify the case as Unknown. Saucer fans classify it as proof that flying saucers exist.