On August 15, 1950, Nick Mariana, manager of the Great Falls Electrics minor league baseball team, was inspecting the field when he observed two bright, silvery objects rotating over the stadium.

This case matters because it is a documented physical event whose object identity remains unresolved.
Documented
On August 15, 1950, Nick Mariana, manager of the Great Falls Electrics minor league baseball team, was inspecting the field when he observed two bright, silvery objects rotating over the stadium.
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.