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Ellsworth AFB Radar-Visual Case and F-84 Pursuit, South Dakota, 1953
August 5, 1953 · Black Hawk Ground Observer Corps post and Ellsworth Air Force Base, near Rapid City, South Dakota
United States
UAP · Other · 24 sources
60Well documented
Pro early
F-94 and Ground Radar Sighting at Nemuro, Hokkaido, 1953
February 7, 1953 · Nemuro AF Detachment, Nemuro, Hokkaido (also listed as "Korean area" and "Okinawa")
Japan
UAP · Unknown · 12 sources
40Partially documented
Pro early
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
Little Rissington UFO Incident
October 21, 1952 · RAF Little Rissington, Gloucestershire
United Kingdom
UAP · Disc / saucer · 17 sources
46Partially documented
Haneda AFB radar-visual sighting and F-94 intercept
August 5, 1952 · Haneda Air Force Base, Tokyo (now Tokyo International Airport), Japan
Japan
UAP · Disc / saucer · 24 sources
61Well documented
Bellefontaine Radar-Visual and Gun-Camera Intercept
August 1, 1952 · Bellefontaine Air Force Station (Campbell Hill) and the Dayton area, Ohio
United States
UAP · Sphere · 19 sources
54Partially documented
Pro early
Pottstown F-94 Starfire Encounter
July 23, 1952 · Pottstown, Montgomery County, Pennsylvania
United States
UAP · Other · 15 sources
26Thinly 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
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
The Asni and Oukaïmeden Sighting and the Moroccan Saucer Cluster of July 1952
July 13, 1952 · Oukaïmeden ski station and the Sanglier qui fume inn near Asni, High Atlas, south of Marrakech
Morocco
UAP · Sphere · 15 sources
37Partially documented
Pro early
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
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
Pro early
Capital Airlines Flight 610 and the lighted object near Andrews AFB (Blue Book Case 1011)
November 18, 1951 · Near Andrews Air Force Base, Prince George's County, Maryland
United States
UAP · Unknown · 11 sources
27Thinly documented
Pro early
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
Pro early
The Mount Kilimanjaro Sighting from an East African Airways Lodestar
February 19, 1951 · Above Mount Kilimanjaro, Tanganyika (now Tanzania), seen from a Lodestar over southern Kenya
Tanzania
UAP · Cigar · 14 sources
29Thinly 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
Pro early
Flight Lieutenant Stan Hubbard's Farnborough discs
August 14, 1950 · Royal Aircraft Establishment airfield, Farnborough, Hampshire
United Kingdom
UAP · Disc / saucer · 15 sources
28Thinly documented
The RAF Tangmere Meteor Flying Saucer and the Wartling Radar Return
June 1, 1950 · Portsmouth area, Hampshire (pilot from RAF Tangmere, radar at RAF Wartling)
United Kingdom
UAP · Disc / saucer · 8 sources
42Partially documented