On November 2, 1971, 16-year-old Ronald Johnson was tending sheep on his family's farm near Delphos, Kansas, when he observed a glowing mushroom-shaped object approximately 3 meters in diameter hovering near the ground.

This case matters because it is a documented physical event whose object identity remains unresolved.
Documented
On November 2, 1971, 16-year-old Ronald Johnson was tending sheep on his family's farm near Delphos, Kansas, when he observed a glowing mushroom-shaped object approximately 3 meters in diameter hovering near the ground.
Debated
The identity of the object
Debated
The adequacy of the conventional explanation
Unverified
Extraterrestrial origin
Unverified
Any claim stronger than the record supports
Sources are kept in separate layers: official and contemporary material is documented; secondary UFO literature is treated as debated, not as primary evidence.
Documented source.
Documented source.
Secondary / debated material.
Secondary / debated material.