| Publication | Article | Year | Month | Day | Author | Language | Notes |
| Observer Magazine | Saucery in West Wales | 1977 | 06 | 19 | |||
| Obsessions | UFOs: Fact or Confabulation? | 1990 | 01 | p. 80-81 | |||
| Occult | UFOs Apparitions of the Air | 1971 | 06 | ||||
| Occult | UFOs Still Unidentified Still Flying | 1975 | 01 | ||||
| Occult | Are the Little People UFOnauts in Disguise | 1975 | 10 | ||||
| Occult Review | Merionethshire Mysteries | 1905 | 03 | Evans | |||
| Occult Review | Merionethshire Mysteries | 1905 | 04 | Theorists . . . | |||
| Occult Review | Merionethshire Mysteries | 1905 | 06 | Sceptics . . . . | |||
| Occult Review | Merionethshire Mysteries | 1905 | 06 | Sceptics . . . . | |||
| Oceania | Our Very Own Cargo Cult (comparison of Cargo Cult and UFO beliefs) | 2000 | V70 2000 | ||||
| Oceans | Sea Squirts | 1973 | 05 | 07 | |||
| Oceans | Origins of the Oceans | 1986 | 07 | 08 | |||
| Oceans | Ocean from Comets | 1988 | 04 | ||||
| O'Cruziero (Brazilian weekly) | Diseo Voador Na Barra da Tijuca | 1952 | |||||
| O'Cruziero (Brazilian weekly) | Discos Voadores Na 6 Regiao Militar | 1958 | 02 | 22 | |||
| O'Cruziero (Brazilian weekly) | A Ronda Dos Siscos Voadores | 1958 | 05 | 10 | |||
| O'Cruziero (Brazilian weekly) | O Cruziero Fotografa Novo Disco Voador | 1958 | 08 | 06 | |||
| O'Cruziero (Brazilian weekly) | Mensagem Do Disco Voador (on Aguila photo, Brazil, 4-24-1959) | 1959 | 06 | 13 | |||
| O'Cruziero (Brazilian weekly) | Los Tripulantes de los Platos Voladores | 1965 | 02 | 01 | |||
| O'Cruziero (Brazilian weekly) | Eles Ja Estao Entre Nos | 1970 | 08 | 04 | |||
| O'Cruziero (Brazilian weekly) | Espaco Nao Estamos Sos | 1970 | 09 | 15 | |||
| O'Cruziero (Brazilian weekly) | Os Depoimentos Categorizados | ||||||
| Odyssey | The Case Against UFOs | 1980 | 05 | ||||
| Off-beat | Suppose a Man from Mars Visited the Earth & Got Murdered | 07 | |||||
| Offshore | Glowing Reports | 1990 | 04 | ||||
| Ohio | Sightings | 1996 | 08 | J. Baumann | p. 42-46, 52-53 | ||
| Ohio Journal of Science | A Description of an Aerial Anomaly Viewed | 1888 | Scott | V88 #2 | |||
| Ohio Journal of Science | Investigation of a Sound Heard Over a Wide Area | 1987 | V87 #2 | ||||
| Ohio Journal of Science | Survey of UAP Reports in Deleware Co., Oh. | 1987 | V87 #1 | ||||
| Ohio Magazine | Identifying the Unidentified | 1982 | 03 | ||||
| Oklahoma City This Week | Bill Shatner Explores Flying Saucer Topic | ||||||
| Old Farmer's Almanac | Flying Saucers or Fairy Rings? | 1967 | p. 50-51 | ||||
| Oldie, The | Several Readers -- | 1993 | 01 | 22 | |||
| Oldie, The | UFO Abductions and the End of Innocence | 1993 | 10 | 29 | |||
| Oldie, The | Believe it or Not or Neither | 1994 | 06 | 10 | |||
| Oldie, The | It Couldn't Happen Here (Abduction Insurance) | 1995 | 04 | ||||
| Oltre Il Cielo (Italy) | Dischi Volanti | 1957 | 10 | 16 | F. Polimeni | Oct 16-31, 1957, p. 78 | |
| Omega | The UFO Debate | 1981 | 01 | Pinkney | 1/2-1981 | ||
| Omega | Scientist Who Have Seen UFOs | 1981 | 03 | Huyghe | 3/4-1981 | ||
| Omega | The UFO Phenomenon Just Does Not Go Away | 1981 | 09 | 9/10-1981 | |||
| Omega | What if . . . | 1981 | 11 | Broderick | 11/12-1981 | ||
| Omega | UFOs: Australia's Secret Documents Revealed | 1982 | 09 | 9/10-1982 | |||
| Omega | The UFO Connection | Chalker | |||||
| On Parade (Australia) | How Did Valentich Vanish? | 1981 | 11 | S. Pym | p. 12-13 | ||
| Online Today | Cabinet of Curiosities | 1988 | 10 | Houdershell | |||
| Open Road | The Great Flying Saucer Mystery | 1950 | 08 | Donovan Fitzpatrick | |||
| Optical Spectra | Shedding Light on UFOs | 1979 | 07 | ||||
| Ordnance | Flying Saucers | 1966 | 07 | 08 | |||
| Ordnance | UFOs Again | 1967 | 03 | 04 | |||
| Oregon Historical Quarterly | From Airships to Flying Saucers | 2000 | Robert Bartholomew | Summer | |||
| Origins of Life | Stanford Workshop on Extraterrestrial Civil. | 1975 | 07 | ||||
| Origins of Life | Lowell & Mars (Book Review) | 1977 | 08 | ||||
| Origins of Life | UFO Phenomena (Book Review) | 1978 | 09 | ||||
| Origins of Life | Conference Report: Life in the Universe | 1980 | V10 | ||||
| Origins of Life | NASA's Exobiology Program | 1984 | V14 | ||||
| Origins of Life | Observational Exobiology | 1986 | V16 | ||||
| Origins of Life | Detection of Planets and Evidence of Life | 1986 | V16 | ||||
| Origins of Life | SETI Past & Present | 1986 | V16 | ||||
| Other Dimensions | The UFO Frustration | 1974 | annual | ||||
| Other World's | Space Ships at Last | 1950 | 01 | ||||
| Other World's | Mystery in the Sky | 1950 | 03 | ||||
| Other World's | The Flying Saucers Grow Up | 1950 | 11 | ||||
| Other World's | I Flew in a Flying Saucer | 1951 | 10 | AVG | |||
| Other World's | I Flew in a Flying Saucer | 1951 | 12 | AVG | |||
| Other World's | The Real Flying Saucers | 1952 | 01 | Arnold | |||
| Other World's | Ltr (the Junior Flying Saucer League) | 1952 | 12 | Miller | |||
| Other World's | Editorial (Arnold) | 1953 | 02 | ||||
| Oui | The Mutilation Mystery | 1976 | 09 | ||||
| Oui | Unidentified Flying Objects | 1976 | 10 | ||||
| Oui | The UFOlogist Establishment | 1976 | 11 | ||||
| Oui | Ltr (UFOs vs Ego) | 1977 | 02 | ||||
| Oui | Strange Vanishings | 1977 | 02 | Sutherly | |||
| Oui | Ltr | 1977 | 02 | ||||
| Oui | Conversation with J. Allen Hynek | 1977 | 04 | ||||
| Oui | Ltr (Gone with the Wind) | 1977 | 05 | ||||
| Oui | On the Trail of the Night Surgeons | 1977 | 05 | ||||
| Oui | The Saucer Men of Tennessee | 1977 | 08 | O'Brien | |||
| Oui | Psychic Touring Map of the U.S. | 1978 | 07 | ||||
| Oui | Star Tricks: The Celibrity UFO Experience | 1981 | 04 | ||||
| Our Western World | Investigation of Mysteries | 1976 | July-Sept | ||||
| Outdoor Life | Aliens Three | 1990 | 11 | McMannis | |||
| Outing | The Ball of Fire | 1888 | V12 | ||||
| Outlook | More UFOs | 1992 | 07 | 08 | |||
| Outre' | Shadows on the Sky, Pt. 2 | 2001 | Vincent Di Fate | #23 | |||
| Outre' | The Flying Saucer Decade (continuation of issue #22 coverage of UFOs) | ||||||
| Outre' | A Basic Introduction & Guide to Flying Saucers | James J.J. Wilson | Issue devoted to flying Saucers | ||||
| Outre' | Shadows on the Sky: The Dawn of the Flying Saucer Era | Vincent DiFate | Issue devoted to flying Saucers | ||||
| Outside | Any Sightings Yet? | 1993 | 10 | ||||
| Outside | Alien Brothers Come On Down | 1994 | 09 | ||||
| Outside | Ltr (Critical Condition) | 1994 | 11 | ||||
| Outspan | Flying Saucer Over Durban (photo) | 1954 | 12 | 03 | J. Dowling | p. 14-15, 17 | |
| Oxford American | Out of this World | 2000 | 09 | Matthew Teague | 09/10 2000 | ||
| Oxford American | People Who Have Been Abducted by UFOs (Ltr) | 2000 | 11 | Selfried | 11/12 2000 | ||
| Ozarks Mountaineer | A Special Spooky Road | 1980 | 07 | 08 | |||
| Ozarks Mountaineer | Spooklight Revisted | 1984 | 09 | 10 |
Previous N [file 9 of 9 “N” files]
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