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Micarta Propellers III : General Description of the Design (1924)
NASA Technical Reports Server (NTRS) · leaf 11
N.A.C.A. Technical Not-. No.200 Figs.11,13 … Fig.11 Rsinforcing 1 Fig.13NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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