McDonnell XH-20 Little Henry (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "McDonnell XH-20 Little Henry" in English language version.

refsWebsite

Global rank English rank

1web.archive.org

1^st place

1^st place

1,290^th place

1,111^th place

1aviationarchives.net

low place

low place

aviationarchives.net

"McDonnell Model Numbers" (PDF). McDonnell Douglas. July 1, 1974. Retrieved September 3, 2023.

boeing.com

"XH-20 Little Henry Research Helicopter". Boeing. Archived from the original on 2009-12-17. Retrieved 2009-12-20.

web.archive.org

"XH-20 Little Henry Research Helicopter". Boeing. Archived from the original on 2009-12-17. Retrieved 2009-12-20.