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Breguet military airplane, type 33 : a two-place long-distance sesquiplane for observation and bombing (1931)
NASA Technical Reports Server (NTRS) · leaf 23
N.A.C.A. Aircraft Circular No. 151 Figs. 19,20,21,22 Pig. 19 Body of Br.S3 showing the two cockpits. Pons Office, AM.c. A.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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