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Rohrbach all metal commercial airplane RO VIII "Roland" (1926)
NASA Technical Reports Server (NTRS) · leaf 8
N.A.C.A. Aircraft Circular No.34 Figs.2,3 4 4. Figs.3,3 4 4 Fhcrbach - Roland Po VIII commercial airplane with three 330 HP. E.M.W. engines.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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