Silsbee, F. B.; Loeb, L. B. & Fonseca, E. L. Heat Energy of Various Ignition Sparks, report, 1920; (https://digital.library.unt.edu/ark:/67531/metadc65708/m1/2/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .

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