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The Effect of Surface Irregularities on Wing Drag. IV - Manufacturing Irregularities. 5; Manufacturing Irregularities (1938)
NASA Technical Reports Server (NTRS) · leaf 10
Fig. if»A ®0 »A« … Figure 4.- Arrangement to show the degree of sheet waviness of service wing.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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