Project HARP (English Wikipedia)

Murphy, Charles; Bull, Gerald (1968). "Gun-launched probes over Barbados". Bulletin of the American Meteorological Society. 49 (6): 640–644. Bibcode:1968BAMS...49..640M. doi:10.1175/1520-0477-49.6.640.
Kampe, H.J. (October 1960). "Meteorological Rocket Network: For Measuring Atmospheric Parameters up to 250.000". Weatherwise. 13 (5): 192–195. Bibcode:1960Weawi..13e.192K. doi:10.1080/00431672.1960.9940979.

apgdiscovery.com (Global: low place; English: low place)

Deutsch, Elliot. "Now that's a big gun!". APG Discovery Center. Retrieved February 11, 2020.

arizona.edu (Global: 1,520^th place; English: 1,044^th place)

repository.arizona.edu

Finger, Daniel. "Telemetry for 250,000-G Gun Environment" (PDF). International Telemetering Conference Proceedings – via The University of Arizona University Libraries.

astronautix.com (Global: 1,562^nd place; English: 1,346^th place)

Graf, Richard. "A Brief History of the HARP Project". Encyclopedia Astronautica. Archived from the original on August 20, 2016. Retrieved February 11, 2020.
"Martlet 3A". Encyclopedia Astronautica. astronautix.com. Archived from the original on 2016-03-04. Retrieved 2016-01-22.

atlasobscura.com (Global: 2,066^th place; English: 1,258^th place)

Grundhauser, Eric (May 2017). "Project HARP Space Gun". Atlas Obscura. Retrieved February 11, 2020.

barbadospocketguide.com (Global: low place; English: low place)

"High Altitude Research Project (HARP Gun)". Barbados Pocket Guide. Retrieved February 11, 2020.

bbc.com (Global: 26^th place; English: 23^rd place)

Park, William (March 17, 2016). "The tragic tale of Saddam Hussein's 'supergun'". BBC. Retrieved February 11, 2020.

books.google.com (Global: 3^rd place; English: 3^rd place)

"Project HARP Leads to U.S.-Canada Study of Low-Orbit Program". Army Research and Development. Vol. 5, no. 5. May 1964. p. 5. Retrieved February 11, 2020.

daviddarling.info (Global: 8,448^th place; English: low place)

"HARP (High Altitude Research Project)". David Darling. Retrieved February 11, 2020.

doi.org (Global: 2^nd place; English: 2^nd place)

Lukasiewicz, Julius (April 1986). "Canada's Encounter with High-Speed Aeronautics". Technology and Culture. 27 (2): 223–261. doi:10.2307/3105144. JSTOR 3105144. S2CID 111725650.
Murphy, Charles; Bull, Gerald (1968). "Gun-launched probes over Barbados". Bulletin of the American Meteorological Society. 49 (6): 640–644. Bibcode:1968BAMS...49..640M. doi:10.1175/1520-0477-49.6.640.
Kampe, H.J. (October 1960). "Meteorological Rocket Network: For Measuring Atmospheric Parameters up to 250.000". Weatherwise. 13 (5): 192–195. Bibcode:1960Weawi..13e.192K. doi:10.1080/00431672.1960.9940979.

dtic.mil (Global: 934^th place; English: 530^th place)

apps.dtic.mil

Marks, Spence; Pilcher, James; Brandon, Fred (March 1966). The Development of a High Acceleration Testing Technique for the Electronic Instrumentation of HARP Projectile Systems (PDF) (Report). Ballistic Research Laboratory. AD635782. Archived from the original (PDF) on June 9, 2020 – via Defense Technical Information Center.
Murphy, Charles; Bull, Gerald (February 1967). HARP 5-Inch and 16-Inch Guns at Yuma Proving Ground, Arizona (PDF) (Report). Ballistic Research Laboratory. AD654123. Archived from the original (PDF) on December 16, 2018 – via Defense Technical Information Center.

friends-partners.org (Global: low place; English: low place)

Graf, Richard (October 31, 2001). "5 inch HARP Gun". Encyclopedia Astronautica. Archived from the original on May 30, 2019. Retrieved February 11, 2020.

governmentattic.org (Global: low place; English: 6,646^th place)

Murphy, Charles; Bull, Gerald (July 1966). Review of the High Altitude Research Program (HARP) (PDF) (Report). Ballistic Research Laboratory. AD645284 – via Government Attic.

inverse.com (Global: 1,941^st place; English: 1,159^th place)

Patel, Neel (June 14, 2016). "A History of Space Guns from Isaac Newton to Nazis in Paris and Project HARP". Inverse. Retrieved February 11, 2020.

jstor.org (Global: 23^rd place; English: 15^th place)

Lukasiewicz, Julius (April 1986). "Canada's Encounter with High-Speed Aeronautics". Technology and Culture. 27 (2): 223–261. doi:10.2307/3105144. JSTOR 3105144. S2CID 111725650.

mcgill.ca (Global: 2,445^th place; English: 1,513^th place)

escholarship.mcgill.ca

Luckert, H.J. (July 1965). Report of the March 1965 test firing series Project HARP (Report). McGill University. SRI-H-R-9.

nasa.gov (Global: 12^th place; English: 73^rd place)

www-istp.gsfc.nasa.gov

Sterling, Bruce (September 1992). "Think of the Prestige". The Magazine of Fantasy and Science Fiction. Retrieved February 11, 2020.

nationaldefensemagazine.org (Global: low place; English: 9,385^th place)

Oberholtzer, William (March 1, 2012). "An Inexpensive Solution for Quickly Launching Military Satellites Into Space". National Defense. Retrieved February 11, 2020.

nps.edu (Global: low place; English: 6,650^th place)

calhoun.nps.edu

Decker, Ryan; Yakimenko, Oleg; Hollis, Michael; Sweeney, Patrick (May 2011). "On the Development of the Artillery Flight Characterization Electronics Rescue Kit" (PDF). Proceedings of the 21st AIAA Aerodynamic Decelerator Systems Technology Conference: 2 – via Calhoun: The NPS Institutional Archive.

ntis.gov (Global: low place; English: low place)

ntrl.ntis.gov

Reed, Harry (1992). Ballisticians in War and Peace (Report). Vol. 3. Ballistic Research Laboratory. ADA300522. Retrieved February 11, 2020 – via National Technical Reports Library.

semanticscholar.org (Global: 15^th place; English: 8^th place)

api.semanticscholar.org

Lukasiewicz, Julius (April 1986). "Canada's Encounter with High-Speed Aeronautics". Technology and Culture. 27 (2): 223–261. doi:10.2307/3105144. JSTOR 3105144. S2CID 111725650.

slate.com (Global: 409^th place; English: 260^th place)

"Abandoned Space Gun Rusting Away in the Barbados Jungle". Slate. July 3, 2013. Retrieved February 11, 2020.

thedrive.com (Global: 2,470^th place; English: 1,575^th place)

Trevithick, Joseph (April 3, 2018). "The Army Now Wants Hypersonic Cannons, Loitering Missiles, And A Massive Supergun". The Drive. Retrieved February 11, 2020.

uottawa.ca (Global: 8,582^nd place; English: 6,246^th place)

artsites.uottawa.ca

Forsyth, Chapman (February 11, 2020). "Upper Atmosphere and Space Programs in Canada - Special Study No 1 - February 1967" (PDF). uOttawa - Canadian Science Councils Archive. Archived from the original (PDF) on June 13, 2020. Retrieved February 11, 2020.

weathermodificationhistory.com (Global: low place; English: low place)

"Project High Altitude Research Program (HARP) Cannons Launch Chemical Payloads Into Space". Weather Modification History. June 1965. Retrieved February 11, 2020.

web.archive.org (Global: 1^st place; English: 1^st place)

Graf, Richard. "A Brief History of the HARP Project". Encyclopedia Astronautica. Archived from the original on August 20, 2016. Retrieved February 11, 2020.
Graf, Richard (October 31, 2001). "5 inch HARP Gun". Encyclopedia Astronautica. Archived from the original on May 30, 2019. Retrieved February 11, 2020.
Forsyth, Chapman (February 11, 2020). "Upper Atmosphere and Space Programs in Canada - Special Study No 1 - February 1967" (PDF). uOttawa - Canadian Science Councils Archive. Archived from the original (PDF) on June 13, 2020. Retrieved February 11, 2020.
Marks, Spence; Pilcher, James; Brandon, Fred (March 1966). The Development of a High Acceleration Testing Technique for the Electronic Instrumentation of HARP Projectile Systems (PDF) (Report). Ballistic Research Laboratory. AD635782. Archived from the original (PDF) on June 9, 2020 – via Defense Technical Information Center.
Murphy, Charles; Bull, Gerald (February 1967). HARP 5-Inch and 16-Inch Guns at Yuma Proving Ground, Arizona (PDF) (Report). Ballistic Research Laboratory. AD654123. Archived from the original (PDF) on December 16, 2018 – via Defense Technical Information Center.
"Martlet 3A". Encyclopedia Astronautica. astronautix.com. Archived from the original on 2016-03-04. Retrieved 2016-01-22.

wired.com (Global: 254^th place; English: 178^th place)

Hanson, Joe (July 8, 2013). "Science Goes Ballistic: 8 Guns for Hunting Knowledge". Wired. Retrieved February 11, 2020.

worldcat.org (Global: 4^th place; English: 4^th place)

search.worldcat.org

Bull, G. V. (Gerald V.) (1988). Paris Kanonen--the Paris guns (Wilhelmgeschütze) and Project HARP : the application of major calibre guns to atmospheric and space research. Murphy, C. H. (Charles H.). Herford [Germany]: E.S. Mittler. ISBN 3-8132-0304-2. OCLC 24066021.

wsmr-history.org (Global: low place; English: low place)

Kennedy, Bruce (February 2015). "Gun Probe Was Used To Study Winds" (PDF). Hands Across History. Retrieved February 11, 2020.

yarchive.net (Global: low place; English: low place)

Dunn, Bruce (July 26, 1996). "Re: Cannon Launch? (Very cheap access to space)". Usenet Archives. Retrieved February 11, 2020.

Project HARP (English Wikipedia)

adsabs.harvard.edu (Global: 14th place; English: 9th place)

ui.adsabs.harvard.edu

apgdiscovery.com (Global: low place; English: low place)

arizona.edu (Global: 1,520th place; English: 1,044th place)

repository.arizona.edu

astronautix.com (Global: 1,562nd place; English: 1,346th place)

atlasobscura.com (Global: 2,066th place; English: 1,258th place)

barbadospocketguide.com (Global: low place; English: low place)

bbc.com (Global: 26th place; English: 23rd place)

books.google.com (Global: 3rd place; English: 3rd place)

daviddarling.info (Global: 8,448th place; English: low place)

doi.org (Global: 2nd place; English: 2nd place)

dtic.mil (Global: 934th place; English: 530th place)

apps.dtic.mil

friends-partners.org (Global: low place; English: low place)

governmentattic.org (Global: low place; English: 6,646th place)

inverse.com (Global: 1,941st place; English: 1,159th place)

jstor.org (Global: 23rd place; English: 15th place)

mcgill.ca (Global: 2,445th place; English: 1,513th place)

escholarship.mcgill.ca

nasa.gov (Global: 12th place; English: 73rd place)

www-istp.gsfc.nasa.gov

nationaldefensemagazine.org (Global: low place; English: 9,385th place)

nps.edu (Global: low place; English: 6,650th place)

calhoun.nps.edu

ntis.gov (Global: low place; English: low place)

ntrl.ntis.gov

semanticscholar.org (Global: 15th place; English: 8th place)

api.semanticscholar.org

slate.com (Global: 409th place; English: 260th place)

thedrive.com (Global: 2,470th place; English: 1,575th place)

uottawa.ca (Global: 8,582nd place; English: 6,246th place)

artsites.uottawa.ca

weathermodificationhistory.com (Global: low place; English: low place)

web.archive.org (Global: 1st place; English: 1st place)

wired.com (Global: 254th place; English: 178th place)

worldcat.org (Global: 4th place; English: 4th place)

search.worldcat.org

wsmr-history.org (Global: low place; English: low place)

yarchive.net (Global: low place; English: low place)

adsabs.harvard.edu (Global: 14^th place; English: 9^th place)

arizona.edu (Global: 1,520^th place; English: 1,044^th place)

astronautix.com (Global: 1,562^nd place; English: 1,346^th place)

atlasobscura.com (Global: 2,066^th place; English: 1,258^th place)

bbc.com (Global: 26^th place; English: 23^rd place)

books.google.com (Global: 3^rd place; English: 3^rd place)

daviddarling.info (Global: 8,448^th place; English: low place)

doi.org (Global: 2^nd place; English: 2^nd place)

dtic.mil (Global: 934^th place; English: 530^th place)

governmentattic.org (Global: low place; English: 6,646^th place)

inverse.com (Global: 1,941^st place; English: 1,159^th place)

jstor.org (Global: 23^rd place; English: 15^th place)

mcgill.ca (Global: 2,445^th place; English: 1,513^th place)

nasa.gov (Global: 12^th place; English: 73^rd place)

nationaldefensemagazine.org (Global: low place; English: 9,385^th place)

nps.edu (Global: low place; English: 6,650^th place)

semanticscholar.org (Global: 15^th place; English: 8^th place)

slate.com (Global: 409^th place; English: 260^th place)

thedrive.com (Global: 2,470^th place; English: 1,575^th place)

uottawa.ca (Global: 8,582^nd place; English: 6,246^th place)

web.archive.org (Global: 1^st place; English: 1^st place)

wired.com (Global: 254^th place; English: 178^th place)

worldcat.org (Global: 4^th place; English: 4^th place)