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Contribution to the technique of landing large airships. Part I (1929)
NASA Technical Reports Server (NTRS) · leaf 44
FigG.22, 49. N.A.C.A. Technical Mor.iorandun Ho.512 Fig.49 Underground Ghods 77ith revolving elevator platform.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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