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The Westland "Wallace" general-purpose airplane (British) : an all-metal biplane (1933)
NASA Technical Reports Server (NTRS) · leaf 8
N.A.C.A. Aircraft Circular No.179 Figs.,4,5,6 Figure 4.-Sectional view showing placing of equipment in the "Wallace" airplane.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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