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Heat energy of various ignition sparks (1920)
NASA Technical Reports Server (NTRS) · leaf 13
1 CO R M \0Z 0 SCO mo /w aw tsoo PlotNo. fZ. Revo/ufionz per Minute.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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