Sikorsky XH-39 (Spanish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Sikorsky XH-39" in Spanish language version.

refsWebsite

Global rank Spanish rank

1sikorskyarchives.com

low place

low place

1books.google.com

3^rd place

7^th place

low place

low place

books.google.com

Hearst Magazines (February 1955). «Sets Helicopter Record». Popular Mechanics (Hearst Magazines): 113.

neam.org

http://neam.org/index.php?option=com_content&view=article&id=882

sikorskyarchives.com

http://www.sikorskyarchives.com/S-59.php