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http://faculty.washington.edu/jcramer/BBSound_2013.html

http://www.theatlantic.com/technology/archive/2012/06/the-mechanics-and-meaning-of-that-ol-dial-up-modem-sound/257816/

http://www.clickhole.com/article/meet-man-who-wrote-song-played-during-dial-interne-1796

http://sterneworks.org/HistoriographyofCyberculture.pdf