| M | 1950-02/18 | 1 | Sjaelland, Denmark |
| M | 1950-05/10 | 2 | W. of Bahia Blanca, Argentina |
| 1950-12/06 | 3 | El Indio, Guerrero, Mexico; nr. DelRio, TX | |
| M! | 1952-05.9 | 4 | Spitsbergen Island, Norway ('47?) |
| (M) | 1952-08 | 5 | Colombus, Ohio |
| (M) | 1952-08/14 | 6 | Ely, Nevada |
| 1953-05/21 | 7 | Kingman, Arizona | |
| 1953-07 | 8 | Camp Polk, Louisiana | |
| 1953-10/07 | 9 | Johannesburg, Republic of S. Africa | |
| 1953-10/13 | 10 | Dutton, Montana | |
| 1955-07 | 11 | Vasternorrland, Sweden | |
| M!! | 1958-11/03 | 12 | Minot, North Dakota |
| 1960-04/05 | 13 | Beira, Mozambique | |
| 1962-04/18 | 14 | Las Vegas, Nevada | |
| (M) | 1964-12/10 | 15 | Fort Riley, Kansas |
| M! | 1965-02/15 | 16 | Mile N. of Minehead, Somerset, England |
| 1965-12/09 | 17 | Kecksburg, Pennsylvania | |
| (M) | 1969-02/18 | 18 | Belgrade, Serbia, Yugoslavia |
| 1974-08/25 | 19 | Coyame, Chihuahua, Mexico | |
| M! | 1975-11/11 | 20 | Nauta, Peru |
| (M) | 1978-05/06 | 21 | Bermejo & Mecoya, Bolivia |
| 1979-06/27 | 22 | Oregon-Idaho Boarder | |
| 1981-08/22 | 23 | Argentina | |
| (M) | 1984-02/19 | 24 | El Yunque, Puerto Rico |
| 1986-01/29 | 25 | Dalnegorsk, Russia |
M =within two months of Mars nearest approach M! =within 1 mo. M!! =Mars nearest this dt.
(M) =within 3 months for 1964 & 1984, within 4 mos. for 1952, 1969, & 19781 "Intercept but Don't Shoot" by Renato Vesco, pg. 18 (reprinted & explanded with author David Childress
in 1994 as "Man-made UFOs 1944-1994; 50 Years of Supression")2 MUFON UFO Journal, December, 1996
3 "A History of UFO Crashes", 1995, by Kevin D. Randle, pg. 192
4 MARCEN (Maryland Center for Investigation of Unconventional Phenomena), list of UFO crashes apparently
compiled shortly after their inception in 1978; they're source: Col. Gernod Darnbyl5 "UFO Crash at Aztec", 1986, by William Steinman, pg. 377
6 MARCEN
7 "A History of UFO Crashes", 1995 by Kevin D. Randle, pgs. 57-68
8 Leonard Stringfield's UFO Crash Retrievals -Status Report No. 3
9 Leonard Stringfield's UFO Crash Retrievals -Status Report No. 2
10 MARCEN & "A History of UFO Crashes", 1995 by Kevin D. Randle, pg. 197
11 UFO-Norway News, No. 1, 1989, Editor Mentz Kaarbo
12 The Blue Book Unknowns, by Don Berliner (FUFOR)
13 "Passport to Magonia", 1993 (orig. 1969) by Jacques Vallee, case no. 502
14 "A History of UFO Crashes", 1995 by Kevin D. Randle, pgs. 79-94 (crashed nr Nellis; test of captured saucer?)
15 UFO Retrievals -The Recovery of Alien Spacecraft", 1995 by Jenny Randles, pgs.98-101
16 Flying Saucer Review, Vol. 11, No. 3, pg. 27
17 "A History of UFO Crashes", 1995 by Kevin D. Randle, pgs. 95-120
18 "UFOs from Behind the Iron Curtain" 1975 by Ion Hibona & Julien Weverbergh, pg. 205
19 Leonard Stringfield's UFO Crash/Retrievals -Status Report VII, pg. 34-37
20 MUFON UFO Journal, No. 129
21 The UFO Cover-Up", 1984 by Lawrence Fawcett & Barry J. Greenwood, pg. 201
22 "A History of UFO Crashes", 1995 by Kevin D. Randle, pg. 209
23 Ibid., pg. 210
24 "The UFO Crash at El Yunque", 1996 by Marc Conza
25 "UFOs -Seugen und Zeichen", Berlin 1995, Illobrand Von Ludviger, editor, pg. 366