XR-9 (Chinese Wikipedia)

Analysis of information sources in references of the Wikipedia article "XR-9" in Chinese language version.

refsWebsite

Global rank Chinese rank

1books.google.com

3^rd place

8^th place

1web.archive.org

1^st place

1^st place

books.google.com

"Short Hop Helicopter". （页面存档备份，存于互联网档案馆） Popular Science, April 1946.

web.archive.org

"Short Hop Helicopter". （页面存档备份，存于互联网档案馆） Popular Science, April 1946.