Stearman XA-21 (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Stearman XA-21" in English language version.

refsWebsite

Global rank English rank

2web.archive.org

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1books.google.com

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books.google.com

"Swift Attack Bombers Race For Jobs In Army Air Corps." Popular Mechanics, June 1939.

web.archive.org

"Stearman XA-21 (Stepped Cockpit)." Museum of the United States Air Force. Retrieved: 17 July 2017.
"Stearman XA-21 (Streamlined Cockpit)." Museum of the United States Air Force. Retrieved: 17 July 2017.