Project Sign (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Project Sign" in English language version.

refsWebsite

Global rank English rank

2web.archive.org

1^st place

1^st place

89^th place

147^th place

489^th place

377^th place

1popularmechanics.com

1,808^th place

1,159^th place

5^th place

5^th place

low place

low place

cia.gov

"CIA's Role in the Study of UFOs, 1947-90 — Central Intelligence Agency". www.cia.gov. Archived from the original on June 13, 2007. Retrieved 2020-04-30.

greyfalcon.us

"An Aeronautical History of Flying Saucers". Archived from the original on 2010-12-17. Retrieved 2011-02-11.

gutenberg.org

Ruppelt, Edward J (1960). The Report on Unidentified Flying Objects (2nd ed.). Doubleday & Company.

popularmechanics.com

Banias, M. J. (2019-12-17). "50 Years Ago, the Air Force Tried to Make UFOs Go Away. It Didn't Work". Popular Mechanics. Retrieved 2020-05-03.

web.archive.org

"CIA's Role in the Study of UFOs, 1947-90 — Central Intelligence Agency". www.cia.gov. Archived from the original on June 13, 2007. Retrieved 2020-04-30.
"An Aeronautical History of Flying Saucers". Archived from the original on 2010-12-17. Retrieved 2011-02-11.

worldcat.org

search.worldcat.org

Project Blue Book : the top secret UFO files that revealed a government cover-up. Steiger, Brad. Newburyport, MA. 2019. ISBN 978-1-59003-300-5. OCLC 1078162415.{{cite book}}: CS1 maint: location missing publisher (link) CS1 maint: others (link)