On 20 August 1949, astronomer Clyde Tombaugh had a sightingat
This incident is Case 43 in Isaac Koi's "Top 100" article, since it was referred to in 57 of the books covered by that article.
Web Resources
This incident is discussed on the AboveTopSecret.com (“ATS”) internet discussion forums in Thread 117356.
There is a rapid turnover of UFO material on the Internet. Many links to material on UFO websites quickly become out of date. Therefore, instead of giving many links to specific webpages I have instead included below a search box which can be used to search various leading UFO websites at the same time. You can then click on tabs at the top of the search results to list only results from forums, only results from websites I have labelled as "skeptical" etc. I have included tabs for a couple of specific websites that I find particularly useful, including the valuable archives of the UFO UpDates email discussion List. The relevant websites are all listed in the discussion of the "UFO Searchillion" search engine in Section 2.4 of the "Free UFO Researcher Starter Pack" and continues to evolve...
The relevant search box is one of the two main tools on this website which are intended to help reduce the amount of reinvention of the wheel within UFOlogy. The other main tool is the collection of tables of references to discussion of UFO incidents, personalities and other matters in various books. Those tables can be sorted by author, length and date. I hope these tools are useful.
Book References
The table below includes references to relevant discussions in UFO/SETI books noted by Isaac Koi during a review of approximately 963 UFO/SETI books during the period 2003-2006 (with a few later additions). The table can be sorted by author, date and length of discussion by clicking on the relevant word in the top line of the table.
Many of the tables of references on this website are considerably longer than the references to books found on most other UFO websites. Indeed, some are probably the longest that have been collated in relation to some events and personalities. Together with the "UFO Searchillion" search box, I hope that these tables are found to be a useful contribution to UFOlogy.
For discussion of Tombaugh’s sighting see the following:
Year |
Discussion by:
|
No. of Pages |
Aczel, Amir in his “Probability 1” (1998) (available on Amazon USA and on Amazon UK) at pages 34-35 (in Chapter 2) of the Little Brown hardback edition. |
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Barclay, David in his “Aliens: The Final Answer?” (1995) (available on Amazon USA and on Amazon UK) at page 92 (in Chapter 6) of the Blandford softcover edition. |
1 |
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Berliner, Don with Galbraith, Marie and Huneeus, Antonio in their “UFO Briefing Document : The Best Available Evidence“ (1995) (available on Amazon USA and on Amazon UK) at page 190 (Part 3:Quotations, section entitled “Scientists”) of the Dell paperback edition. |
1 |
|
Brookesmith, Peter in his “UFO: The Complete Sightings Catalogue” (1995) (available on Amazon USA and on Amazon UK) at page 52 (in Chapter 3) of the BCA hardback edition (with the same page numbering in the Blitz hardback edition, and in the Barnes & Noble hardback edition published under the title “UFO: The Complete Sightings”). |
1 |
|
Campbell, Steuart in his “The UFO Mystery Solved” (1994) (available on Amazon USA and on Amazon UK) at page 76 (in Chapter 4) of the Explicit Books softcover edition. |
1 |
|
Clark, Jerome in his “The UFO Book: Encyclopedia of the Extraterrestrial” (1998) (available on Amazon USA and on Amazon UK) at pages 559-561 of the Visible Ink Press softcover edition in an entry entitled “Tombaugh Sighting”. |
3 |
|
Clark, Jerome in his “The UFO Encyclopedia: 1st edition: Volume 2 – Emergence of a Phenomenon” (1992) (available on Amazon USA and on Amazon UK) at pages 104-106 of the Omnigraphics hardback edition in an entry entitled “Clyde Tombaugh Sighting”. |
3 |
|
Clark, Jerome in his “The UFO Encyclopedia: The Phenomenon from the Beginning - 2nd edition” (1998) (available on Amazon USA and on Amazon UK) in Volume 2:L-Z at pages 895-897 (in an entry entitled “Tombaugh Sighting”) of the Omnigraphics hardback edition. |
3 |
|
Clark, Jerome in his “UFO Encounters” (1992) (available on Amazon USA and on Amazon UK) at page 47 (in the unnumbered chapter entitled “The Dimensions of a Phenomenon”) of the Publications International hardback edition. |
1 |
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Collins, Jim in his “Unidentified Flying Objects” (1977) (available on Amazon USA and on Amazon UK) at page 13 (in Chapter 2) of the Raintree hardback edition. |
1 |
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Davenport, Marc in his “Visitors from Time” (1992) (available on Amazon USA and on Amazon UK) at page 92 (in Chapter 7) of the 1994 revised Greenleaf softcover edition. |
1 |
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Denzler, Brenda in her “The Lure of the Edge” (2001) (available on Amazon USA and on Amazon UK) at page 74 (in Chapter 3) of the |
1 |
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Dolan, Richard M in his “UFOs and the National Security State: Volume 1: 1941-1973” (2000) (available on Amazon USA and on Amazon UK) at page 123 (in Chapter 3) of the Keyhole softcover edition, omitted from the 2002 revised Hampton Road softcover edition. |
1 |
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Edwards, Frank in his “Flying Saucers – Serious Business” (1966) (available on Amazon USA and on Amazon UK) at page 23 (in Chapter 1) of the Bantam paperback edition, at pages 29-30 of the Mayflower-Dell paperback edition. |
1 |
|
Edwards, Frank in his “Strange World” (1964) (available on Amazon USA and on Amazon UK) at page 21 (in Chapter 3) of the Ace paperback edition. |
1 |
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Edwards, Frank in his “Strangest of All” (1962) (available on Amazon USA and on Amazon UK) at page 170 (in the unnumbered chapter entitled “Authorities Who Believe in Flying Saucers”) of the Ace paperback edition. |
1 |
|
Emmons, Charles F in his “At The Threshold: UFOs, Science and the New Age” (available on Amazon USA and on Amazon UK) at page 86 (in Chapter 5) of the Wild Flower Press softcover edition. |
1 |
|
Fawcett, George and Greenwood, Barry in their “Clear Intent” (1984) (available on Amazon USA and on Amazon UK) at page 213 (in Chapter 14) of the Spectrum softcover edition (with the same page numbering in the Fireside softcover edition published under the title “The UFO Cover-Up”). |
1 |
|
Flammonde, Paris in his “Ufo Exist!” (1976) (available on Amazon USA and on Amazon UK) at pages 170-171 (in Chapter 9), 270 (in Chapter 14), 331 (in Chapter 16) of the Ballantine Books paperback edition. |
4 |
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Glenday, Craig in his “The UFO Investigator’s Handbook” (1999) (available on Amazon USA and on Amazon UK) at page 22 (in Chapter 1) of the Running Press softcover edition. |
1 |
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Greenfield, Irving A in his “The UFO Report” (1967) at pages 50-51 (in Chapter 5) of the Lancer paperback edition. |
2 |
|
Guieu, Jimmy in his “Flying Saucers Come From Another World” (1956) (edited by Ronald Story) (edited by Ronald Story) (available on Amazon USA and on Amazon UK) at page 193 (in Chapter 8) of the Hutchinson hardback edition. |
1 |
|
Hall, Michael David and Connors, Wendy Ann in their “Captain Edward J Ruppelt : Summer of the Saucers - 1952” (2000) (available on Amazon USA and on Amazon UK) at pages 16-17 (in Chapter 1) of the Rose Press softcover edition. |
2 |
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Hall, Michael David in his “UFOs : A Century of Sightings” (1999) (available on Amazon USA and on Amazon UK) at page 128 (in Chapter 3) of the Galde Press softcover edition. |
1 |
|
Hall, Richard in “Flying Saucers Have Arrived!” (1970) (edited by Jay David) (available on Amazon USA and on Amazon UK) at pages 56-58 (in the unnumbered chapter entitled “Pigeon-holes of Science”) of the World hardback edition. The relevant chapter is reprinted from “The Challenge of Unidentified Flying Objects” by Maney, Charles And Richard Hall. |
3 |
|
Kettelkamp, Larry in his “Investigating UFOs” (1971) (available on Amazon USA and on Amazon UK) at pages 26-27 (in the unnumbered chapter entitled “Sightings and Cases”) of the Target softcover edition. |
2 |
|
Keyhoe, Donald E in his “Flying Saucers: Top Secret” (1960) (available on Amazon USA and on Amazon UK) at page 46 of the G P Putnam hardback edition (in Chapter 3). |
1 |
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Landsburg, Alan in his “In Search of Extraterrestrials” (1976) (available on Amazon USA and on Amazon UK) at pages 125-126 (in Chapter 10) of the Corgi paperback edition. |
2 |
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Lawson, Alvin H in “Thesis Antithesis” (1975) (edited by A D Emerson) at page 49 (in Part |
1 |
|
Lore, Gordon and Deneault, Harold in their “Mysteries of the Skies” (1968) (available on Amazon USA and on Amazon UK) at page 169 (in the Epilogue) of the Prentice-Hall hardback edition. |
1 |
|
Lorenzen, Coral E in her “The Great Flying Saucer Hoax” (1962) (available on Amazon USA and on Amazon UK) at page 217 (in Chapter 14) of the APRO hardback edition. |
1 |
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Maney, Charles And Hall, Richard in their “Challenge of Unidentified Flying Objects” (1961) (available on Amazon USA and on Amazon UK) at pages 144-146 (in Part 3, Chapter 7, by Richard Hall) of the privately published hardback edition. |
3 |
|
McDonald, James E in his prepared statement to the Roush Hearing (the U.S. House of Representatives Committee on Science and Astronautics "Symposium on Unidentified Flying Objects" on 1968.0729) as Case 20 at pages 59-60, 82 of the transcript of the Ninetieth Congress, Second Session, Number 7. Complete transcript available free online at the following links: http://ncas.sawco.com/ufosymposium/contents.html http://www.project1947.com/shg/symposium/contents.html |
3 |
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Menzel, Donald and Lyle Boyd in their “The World of Flying Saucers” (1963) (available on Amazon USA and on Amazon UK) at pages 266-270 of the Doubleday hardback edition (Chapter XII). |
5 |
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Menzel, Donald in his “Flying Saucers“ (1953) (available on Amazon USA and on Amazon UK) at pages 36-38 (in Chapter 3) of the Putnam hardback edition. |
3 |
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Michel, Aime in his “The Truth about Flying Saucers” (1956) (available on Amazon USA and on Amazon UK) at pages 57-60 (in Part 1, Chapter 2) of the Robert Hale hardback edition, pages 60-64 of the Pyramid paperback edition. |
4 |
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Moseley, James and Pflock, Karl in their “Shockingly Close to the Truth!” (2002) (available on Amazon USA and on Amazon UK) at pages 56-57 (in Chapter 2) of the Prometheus hardback edition. |
2 |
|
Moseley, James in “UFO: 1947-1997” (1997) (edited by Hilary Evans and Dennis Stacy) (available on Amazon USA and on Amazon UK) at page 59 of the John Brown hardback edition (Section entitled “The 1950s”, unnumbered chapter entitled “UFOs Out West”). |
1 |
|
NICAP in its “The UFO Evidence” (1964) (edited by Richard Hall) (available on Amazon USA and on Amazon UK) at page 53 (in Section 6, “Scientists & Engineers”) of the privately published paperbound edition, with the same page numbering in the 1997 Barnes & Noble paperbound reprint. Available free online at: http://www.nicap.org/ufoe/section_6.htm |
1 |
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Palmer, Raymond A in his “The Real UFO Invasion” (1967) (available on Amazon USA and on Amazon UK) at pages 23-25 (in Chapter 1) of the Greenleaf paperback edition. |
3 |
|
Randle, Kevin in his “Project Bluebook Exposed” (1997) (available on Amazon USA and on Amazon UK) at pages 179-180 (in the unnumbered chapter entitled “So, What Do We Make of All This?”) of the Marlowe softcover edition. |
2 |
|
Randle, Kevin in his “Project Moon Dust” (1998) (available on Amazon USA and on Amazon UK) at pages 104-109 (in Chapter 5) of the |
6 |
|
Randles, Jenny in her “Alien Contact – The First Fifty Years” (1997) (available on Amazon USA and on Amazon UK) at page 13 (in the chapter entitled “1949”) of the Collins and Brown hardback edition. |
1 |
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Randles, Jenny in her “The Little Giant Encyclopedia of UFOs” (2000) (available on Amazon USA and on Amazon UK) at pages 38 (in Part 1, “A UFO Timeline”), 381 (in Part 3, “UFOs Worldwide”) of the |
2 |
|
Randles, Jenny in her “UFOs and How to See Them” (1992) (available on Amazon USA and on Amazon UK) at page 65 (in Chapter 4) of the Brockhampton Press hardback edition. |
1 |
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Rehn, K Gosta in his “UFOs Here and Now” (1974) (available on Amazon USA and on Amazon UK) at pages 66-67 (in the unnumbered chapter entitled “Fresh Contributions from Scientists”) of the Abelard-Schuman hardback edition. |
2 |
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Sachs, Margaret in her “The UFO Encyclopedia“ (1980 (available on Amazon USA and on Amazon UK) at page 322 (in an entry entitled “Tombaugh, Clyde W”) and page viii (included in a list entitled “Chronological list of UFO sightings”) of the Corgi softback edition. |
2 |
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Sparks, Brad in version 1.7 of his “Comprehensive Catalog of 1,500 Project |
1 |
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Spencer, John and Anne Spencer in their “Fifty Years of UFOs” (1997) (available on Amazon USA and on Amazon UK) at page 26 (in the unnumbered chapter entitled “1947-1957”) of the Boxtree hardback edition. |
1 |
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Stemman, |
2 |
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Stringfield, Leonard H in his “Situation Red: The UFO Siege” (1977) (available on Amazon USA and on Amazon UK) at pages 50-51 (in Chapter 2) of the Fawcett paperback edition. |
2 |
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Thompson, Richard in his “Alien Identities: Ancient Insights into Modern UFO Pheonemena” (1993) (available on Amazon USA and on Amazon UK) at pages 24, 37 (in Chapter 1) of the GHP revised softcover edition. |
2 |
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Trench, Brinsley Le Poer (i.e. Lord Clancarty) in The House of Lords UFO Debate (1979.0118) at column |
1 |
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Trench, Brinsley Le Poer in his “The Flying Saucer Story” (1966) (available on Amazon USA and on Amazon UK) at pages 25-26 (in Chapter 3) of the revised Tandem paperback edition. |
2 |
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Vallee, Jacques and Vallee, Janine in their “Challenge to Science – The UFO Enigma” (1966) (available on Amazon USA and on Amazon UK) at page 106 (in Chapter 5) of the Ballantine Books paperback edition, at page 90 of the Tandem paperback edition. |
1 |
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Von Buttlar, Johannes in his “The UFO Phenomenon” (1980) (available on Amazon USA and on Amazon UK) at pages 59-60 (in Chapter 5) of the Book Club Associates hardback edition. |
2 |
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Williamson, George Hunt with Bailey, Alfred in their “Other Voices” (1995) (available on Amazon USA and on Amazon UK) (a reisussed and expanded version of their “The Saucers Speak” (1954)) at page 128 (in the Epilogue) of the Abeldard softcover edition. |
1 |
Other Material
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