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Krysko, M.  (2018, April 26). American Radio and Technological Transformation from Invention to Broadcasting, 1900–1945. Oxford Research Encyclopedia of American History.  Retrieved 25 Jun. 2019, from https://oxfordre.com/americanhistory/view/10.1093/acrefore/9780199329175.001.0001/acrefore-9780199329175-e-414.