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Resistance of Transparent Plastics to Impact (1939)
NASA Technical Reports Server (NTRS) · leaf 24
Figs.7,10 N.A.C.A. Technical Note No. 718 Figure 10.- Frame used to hold 14ffX18" specimens for high-velocity impact tests.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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