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Physical Properties of Synthetic Resin Materials (1939)
NASA Technical Reports Server (NTRS) · leaf 31
N.A.C.A. Technical Note No. 694 Pig. 12 Figure112. - Photomicrograph of notched specimen of synthetic resin.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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