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The Present Status of Airship Construction, Especially of Airship-framing Construction (1938)
NASA Technical Reports Server (NTRS) · leaf 33
N.A.C.A. Technical Memorandum No. 872 Figs. 13,14,15,16,17,18 … ship PURITAN. Figure 18.- Assembly of ring types.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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