United States. Bureau of the Census., Mayer, W., Abbott, A. V. (Arthur Vaughan)., Martin, T. Commerford., Steuart, W. M. (William Mott). (1906). Telephones and telegraphs: 1902: [and Municipal electric fire alarm and police patrol systems]. Washington: Govt. Print. Off..MLA Citation
Steuart, W. M. (William Mott), et al.. Telephones And Telegraphs: 1902: [and Municipal Electric Fire Alarm And Police Patrol Systems]. Washington: Govt. Print. Off., 1906.
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