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Telephone and Telegraph Systems

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United States. Bureau of the Census. "Telephone and Telegraph Systems," in United States. Bureau of the Census. Historical Statistics of the United States : Colonial Times to 1957 , 1960 : 482-497. https://fraser.stlouisfed.org/title/1208/toc/525983 , accessed on July 12, 2020.

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Federal Reserve Bank of St. Louis, One Federal Reserve Bank Plaza, St. Louis, MO 63102