1881 Map of the Japanese telegraph system, by the Shanghai Courier and Celestial Empire of Feburary 15, 1881, from the Digital Commonwealth - commonwealth 0z7097514. (<a rel="nofollow" class="external free" href="https://www.digitalcommonwealth.org/search/commonwealth:0z7097514">https://www.digitalcommonwealth.org/search/commonwealth:0z7097514</a>)
Shanghai Courier and Celestial Empire
Digital Commonwealth