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WikiPedia: Focke-Wulf Fw 61 http://www.luftfahrtmuseum.com/htmi/itf/fw61.htm http://www.bredow-web.de/ILA_2006/Historische_Flug... http://www.return2style.de/swingaring/amifw61.htm http://www.centennialofflight.gov/essay/Rotary/Foc... http://www.vectorsite.net/avheli_1.html#m4 http://www.warbirdsresourcegroup.org/LRG/fw61.html https://web.archive.org/web/20121014092452/http://... https://web.archive.org/web/20160303233647/http://...