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Launius, R.  Piccard, Jean Félix (1884-1963), aeronautical engineer and chemist noted for his stratospheric balloon flights. American National Biography. Retrieved 14 Jun. 2021, from https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-2000785.