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The Day UFOs Stopped Play: Florence Stadium Mass Sighting
October 27, 1954 · Stadio Comunale (now Stadio Artemio Franchi), Campo di Marte, Florence, Tuscany
Italy
UAP · Egg · 49 sources
39Partially documented
The Gravataí Air Force Base sighting and the Brazilian Air Force's statements
October 24, 1954 · Gravataí Air Force Base (now Canoas Air Force Base), near Porto Alegre, Rio Grande do Sul
Brazil
UAP · Disc / saucer · 17 sources
36Partially documented
Flt Lt James Salandin's Meteor near miss over Southend-on-Sea
October 14, 1954 · Over the outlying districts of Southend-on-Sea, Thames Estuary, Essex
United Kingdom
UAP · Disc / saucer · 6 sources
17Thinly documented
The Saint-Nicolas-de-Redon Locomotive Crew Sighting
September 28, 1954 · La Butte du Rouge, marshes of Saint-Nicolas-de-Redon, near Redon, Loire-Atlantique
France
UAP · Cigar · 10 sources
15Thinly documented
The Vernon Cigar and Five Discs: Bernard Miserey's Night over the Seine
August 23, 1954 · Vernon, Eure, Normandy (banks of the Seine)
France
UAP · Cigar · 17 sources
25Thinly documented
Tananarive mass sighting and blackout
August 16, 1954 · Avenue de la Libération, Tananarive (Antananarivo)
Madagascar
UAP · Cigar · 27 sources
33Partially documented
The F-94 Interceptor Encounter near Hanford (Odessa Case)
December 10, 1952 · Odessa, Washington (popularly placed near the Hanford plant)
United States
UAP · Sphere · 20 sources
49Partially documented
B-29 radar-visual encounter over the Gulf of Mexico (Karas, Naumann / "Harter and Coleman")
December 6, 1952 · Gulf of Mexico, about 100 miles south of the Louisiana coast, about 190 miles from Galveston, Texas
United States
UAP · Other · 23 sources
47Partially documented
The RAF Topcliffe "Perfect Flying Saucer" During Exercise Mainbrace
September 19, 1952 · RAF Topcliffe, near Thirsk, North Yorkshire (approach to RAF Dishforth)
United Kingdom
UAP · Disc / saucer · 20 sources
33Partially documented
Yaak Air Force Station radar-visual sightings
September 1, 1952 · Yaak Air Force Station, Hensley Hill, Lincoln County, Montana
United States
UAP · Cigar · 12 sources
40Partially documented
The 1952 Washington, D.C. UFO Flap
July 19, 1952 · Washington National Airport and Andrews AFB, Washington, D.C. area
United States
UAP · Orb / light · 97 sources
61Well documented
Paul R. Hill's Hampton Roads sighting
July 16, 1952 · Hampton waterfront, looking south over Hampton Roads, Virginia
United States
UAP · Sphere · 20 sources
26Thinly documented
The Nash-Fortenberry Sighting over Chesapeake Bay
July 14, 1952 · Over Chesapeake Bay, near Newport News, Virginia
United States
UAP · Disc / saucer · 23 sources
25Thinly documented
Davis-Monthan AFB: Two Discs Pace a B-36 (The Case of the Missing Report)
May 1, 1952 · Davis-Monthan AFB, Tucson, Pima County, Arizona
United States
UAP · Disc / saucer · 19 sources
32Partially documented
Project Second Storey, Canada's Interdepartmental UFO Committee
April 22, 1952 · Ottawa, Ontario
Canada
UAP · Disc / saucer · 21 sources
40Partially documented
Flying Saucers over the Belgian Congo Uranium Mines (Elisabethville, 1952)
c. 1952 · Elisabethville district (now Lubumbashi), over the uranium mines of southern Katanga, Belgian Congo
Democratic Republic of the Congo
UAP · Disc / saucer · 24 sources
30Partially documented
The Kaliszewski Balloon-Crew Sightings
October 10, 1951 · About 10 miles east of St. Croix Falls, Wisconsin, and north of Minneapolis, Minnesota
United States
UAP · Cigar · 24 sources
37Partially documented
Fort Monmouth radar and T-33 sightings
September 10, 1951 · Fort Monmouth, Point Pleasant and Sandy Hook, New Jersey
United States
UAP · Disc / saucer · 20 sources
49Partially documented
The Bethune Encounter: US Navy Flight 125 off Newfoundland
February 10, 1951 · North Atlantic, about 200 miles northeast of Argentia, Newfoundland (the 'Gander' case)
Canada
UAP · Disc / saucer · 24 sources
33Partially documented
The Sioux City Mystery Plane
January 20, 1951 · Sioux City municipal airport (now Sioux Gateway Airport), Sioux City, Iowa
United States
UAP · Other · 18 sources
38Partially documented