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The Sikorsky Twin Engined Amphibian, Type S-38, Model 1928 (1928)
NASA Technical Reports Server (NTRS) · leaf 15
JT.A.C.A. Aircraft Circular No.79 Fig.l Areas; Upper wing 574 sq.ft Lower "j* 146 " « Fig.l Sikorsky twin-motor amphibian flying boat' Model. 1928.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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