The PRUFOS Police Database:
On Duty Sightings
UFO sightings reported by UK Police Officers on duty:
On duty sightings (1901-1972):
http://www.prufospolicedatabase.co.uk/2.html
On duty sightings (1973-1985):
http://www.prufospolicedatabase.co.uk/3.html
On duty sightings (1986-2008):
http://www.prufospolicedatabase.co.uk/4.html
(Kornkreise-Forschung.de image)