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Methods for the Identification of Aircraft Tubing of Plain Carbon Steel and Chromium-Molybdenum Steel (1930)
NASA Technical Reports Server (NTRS) · leaf 30
KACA Technical Hete Mo. 350 fig: 3.4 … tiiiNASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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