A history of engineering and science in the bell system communications sciences (1925-1980) - Fagen, M. D.; Joel, Amos E.; Schindler, G. E.; Bell Telephone Laboratories, inc. (New York : AT & T Bell Laboratories, 1975)
Keywords: Telephone -- United States -- History; Telecommunication -- United States -- History; Electronics -- United States -- History; American telephone and telegraph company -- History