Vought-Sikorsky VS-300 (Italian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Vought-Sikorsky VS-300" in Italian language version.

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1web.archive.org

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web.archive.org

(EN) The Planes: 1939 Sikorsky VS300A Helicopter, in Heroes of the sky, The Henry Ford. URL consultato l'11 luglio 2008 (archiviato dall'url originale il 15 giugno 2010).