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Avia pursuit airplane B.H. 21 (1926)
NASA Technical Reports Server (NTRS) · leaf 7
I.A.C.A. Aircraft Circular No. 22 Figs.2,3 4 4 Figs.3,3 4 4 B.H.31 pursuit airplane,300 HP. Hispano-Suiza engineNASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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