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English airplane construction (1930)
NASA Technical Reports Server (NTRS) · leaf 14
N.A.C.A. Technical Memorandum No.595 rigs.12,15,16,17,18 19 20 21.22.i23,24,25,E6, ^zsL—1^6.31 Pig.12 Supermarine rust proof fittings.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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