American telephone and telegraph co. (1922). AT & T Bell lab technical journal. American telephone and telegraph co.
Dyfyniad Arddull ChicagoAmerican telephone and telegraph co. AT & T Bell Lab Technical Journal. New York: American telephone and telegraph co, 1922.
Dyfyniad MLAAmerican telephone and telegraph co. AT & T Bell Lab Technical Journal. American telephone and telegraph co, 1922.
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