Curtiss XA-4 (Polish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Curtiss XA-4" in Polish language version.

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2web.archive.org

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archive.is

Ray Wagner: American Combat Planes of the 20th Century (Curtiss Falcon, page 2).

web.archive.org

Curtiss XA-4. nationalmuseum.af.mil, 2008/12/30. [dostęp 2013-10-01]. (ang.).
Curtiss XA-5. nationalmuseum.af.mil, 2008/12/30. [dostęp 2013-10-01]. (ang.).