Lockheed SR-71 Blackbird (Simple English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Lockheed SR-71 Blackbird" in Simple English language version.

refsWebsite

Global rank Simple English rank

1smithsonianmag.com

503^rd place

209^th place

low place

7,014^th place

8^th place

7^th place

bbc.co.uk

news.bbc.co.uk

"Q&A: Nasa's jet speed record". BBC News. 2004-11-17. Retrieved 2009-09-02.

smithsonianmag.com

Edwards, Owen (July 2009). "The Ultimate Spy Plane". Smithsonian Magazine. Retrieved 2017-11-27. The 32 Blackbirds cost an average of $34 million each.

sr-71.org

sr-71.org