Piasecki H-21 (English Wikipedia)

"Piasecki H-21 / CH 21B Workhorse". American Helicopter Museum & Education Center. Archived from the original on 21 October 2016. Retrieved 21 October 2016.

archive.today

"Helikopter – Gotlands Försvarsmuseum". digitaltmuseum.org (in Swedish). Tingstäde: Gotlands Forsvarsmuseum. 18 October 2017. Archived from the original on 27 July 2020. Retrieved 27 July 2020.

boeing.com

"Boeing: Historical Snapshot: CH-21 Shawnee/Vertol 44 Helicopter".

books.google.com

"Here Comes the Leathernecks." Popular Mechanics, April 1952, p. 101, bottom of page.
"Flying Salvage Craft Works on Land Or Sea." Popular Mechanics, July 1957, p. 106
"Workhorses of the Air." Popular Mechanics, March 1959, p. 100.

comoxairforcemuseum.ca

"Guide to the Aircraft of the CAFM Heritage Air Park" (PDF). Retrieved 3 September 2022.

digitaltmuseum.org

"Helikopter – Gotlands Försvarsmuseum". digitaltmuseum.org (in Swedish). Tingstäde: Gotlands Forsvarsmuseum. 18 October 2017. Archived from the original on 27 July 2020. Retrieved 27 July 2020.

evergreenmuseum.org

"Helicopters". Evergreen Museum Campus. Evergreen Museum. Archived from the original on 31 May 2017. Retrieved 20 October 2016.

faa.gov

registry.faa.gov

"FAA REGISTRY [N64606]". Federal Aviation Administration. U.S. Department of Transportation. Archived from the original on 29 February 2012. Retrieved 20 October 2016.

flightglobal.com

"World Air Forces 1955 pg. 621". flightglobal.com. Retrieved 4 August 2018.
"World Helicopter Market 1967 pg. 60". flightglobal.com. Retrieved 4 August 2016.
"World Helicopter Market 1967 pg. 62". Flightglobal Insight. 2018. Retrieved 4 August 2018.
"World Helicopter Market 1967 pg. 65". flightglobal.com. Retrieved 4 August 2016.
"World Helicopter Market 1967 pg. 61". flightglobal.com. Retrieved 4 August 2016.
"Helicopters in Civil Operations pg. 388". flightglobal.com. 21 March 1958. Retrieved 10 February 2015.

flugausstellung.de

"Flugzeuge". Flugausstellung. Archived from the original on 31 December 2015. Retrieved 21 October 2016.

flygvapenmuseum.se

"Hkp 1". flygvapenmuseum.se (in Swedish). Linköping: Statens Försvarshistoriska museeer. 21 April 2010. Archived from the original on 13 August 2010. Retrieved 21 October 2016.

geocities.ws

Carroll, Sean. "[Untitled]". Retrieved 21 October 2016.

helis.com

"aéronautique navale H-21". helis.com. Retrieved 5 January 2013.

hubschraubermuseum.de

"Vertol V-43 (H-21C)". Das Hubschraubermuseum Bückeburg. Retrieved 21 October 2016.^{[permanent dead link‍]}

illinois.edu

m-selig.ae.illinois.edu

Lednicer, David. "The Incomplete Guide to Airfoil Usage". m-selig.ae.illinois.edu. Retrieved 16 April 2019.

j-hangarspace.jp

Thompson, Paul. "JGSDF – Where Are They Now?". J-Hangar Space. J-HangarSpace. Retrieved 21 October 2016.
Thompson, Paul. "JASDF – Where Are They Now?". J-HangarSpace. Retrieved 21 October 2016.

jsf.or.jp

tam-web.jsf.or.jp

"Experience Exhibits". Tokorozawa Aviation Museum. Archived from the original on 14 March 2016. Retrieved 21 October 2016.

maam.org

"Aircraft of the Mid-Atlantic Air Museum". Mid-Atlantic Air Museum. Archived from the original on 7 June 2012. Retrieved 20 October 2016.

marchfield.org

"H-21 Workhorse". March Field Air Museum. Archived from the original on 21 October 2016. Retrieved 20 October 2016.

matsuk12.us

"Heritage Park Tour Briefing" (PDF). Matanuska-Susitna Borough School District. May 2007. Retrieved 21 October 2016.

museum-digital.de

"Transporthubschauber Vertol (Piasecki) V-43A (H-21C) (Luftfahrzeugkennung der Bundeswehr: 83+08)". Militärhistorische Museum der Bundeswehr Flugplatz Berlin Gatow (in German). 2 January 2016. Retrieved 20 October 2016.

museumofaviation.net

"CH-21B "Workhorse"". Museum of Aviation. Retrieved 20 October 2016.

museumofflight.org

"Piasecki H-21B (CH-21B) Workhorse". The Museum of Flight. Retrieved 20 October 2016.

nytimes.com

timesmachine.nytimes.com

Halberstam, David (19 January 1963). "Army Copter Pilots in Vietnam Say H-21's Are Not Adequate". The New York Times. p. 3. Retrieved 3 May 2019.

pimaair.org

"WORKHORSE". Pima Air & Space Museum. Pimaair.org. Archived from the original on 21 October 2016. Retrieved 20 October 2016.

pwam.org

"Actual Aircraft Aircraft on Display in Pueblo". Pueblo Weisbrod Aircraft Museum. Archived from the original on 25 December 2016. Retrieved 20 October 2016.

rotors.org

"Vertol H-21 Shawnee/Work Horse". Classic Rotors. Archived from the original on 3 March 2016. Retrieved 20 October 2016.

sacmuseum.org

"CH-21B "Work Horse"". Strategic Air Command & Aerospace Museum. Retrieved 20 October 2016.

silverhawkauthor.com

"Harold A. Skaarup, author of Shelldrake". silverhawkauthor.com. Archived from the original on 6 January 2019. Retrieved 6 January 2019.

sipri.org

armstrade.sipri.org

"Trade Registers". Armstrade.sipri.org. Archived from the original on 14 April 2010. Retrieved 3 February 2019.

ussalabama.com

"AIRCRAFT COLLECTION". Battleship Memorial Park. USS ALABAMA. Archived from the original on 28 July 2016. Retrieved 20 October 2016.

vintageflyingmuseum.org

"Piasecki CH-21B Workhorse". Vintage Flying Museum. Retrieved 20 October 2016.

web.archive.org

"Trade Registers". Armstrade.sipri.org. Archived from the original on 14 April 2010. Retrieved 3 February 2019.
"Harold A. Skaarup, author of Shelldrake". silverhawkauthor.com. Archived from the original on 6 January 2019. Retrieved 6 January 2019.
"Flugzeuge". Flugausstellung. Archived from the original on 31 December 2015. Retrieved 21 October 2016.
"Experience Exhibits". Tokorozawa Aviation Museum. Archived from the original on 14 March 2016. Retrieved 21 October 2016.
"Hkp 1". flygvapenmuseum.se (in Swedish). Linköping: Statens Försvarshistoriska museeer. 21 April 2010. Archived from the original on 13 August 2010. Retrieved 21 October 2016.
"Vertol H-21 Shawnee/Work Horse". Classic Rotors. Archived from the original on 3 March 2016. Retrieved 20 October 2016.
"FAA REGISTRY [N64606]". Federal Aviation Administration. U.S. Department of Transportation. Archived from the original on 29 February 2012. Retrieved 20 October 2016.
"AIRCRAFT COLLECTION". Battleship Memorial Park. USS ALABAMA. Archived from the original on 28 July 2016. Retrieved 20 October 2016.
"H-21 Workhorse". March Field Air Museum. Archived from the original on 21 October 2016. Retrieved 20 October 2016.
"Actual Aircraft Aircraft on Display in Pueblo". Pueblo Weisbrod Aircraft Museum. Archived from the original on 25 December 2016. Retrieved 20 October 2016.
"Aircraft of the Mid-Atlantic Air Museum". Mid-Atlantic Air Museum. Archived from the original on 7 June 2012. Retrieved 20 October 2016.
"Piasecki H-21 / CH 21B Workhorse". American Helicopter Museum & Education Center. Archived from the original on 21 October 2016. Retrieved 21 October 2016.
"Helicopters". Evergreen Museum Campus. Evergreen Museum. Archived from the original on 31 May 2017. Retrieved 20 October 2016.
"CH-21C "Workhorse"". Hill Air Force Base. 27 September 2007. Archived from the original on 19 October 2016. Retrieved 20 October 2016.
"WORKHORSE". Pima Air & Space Museum. Pimaair.org. Archived from the original on 21 October 2016. Retrieved 20 October 2016.
"Aircraft Inventory". Flight Test Historical Foundation. Archived from the original on 19 October 2016. Retrieved 21 October 2016.