Report of J. J. Williams, Chief Engineer, upon the location of the Tehuantepec Railway and Carriage Road across the Isthmus of Tehuantepec, with the Map and Profiles as approved by the Gobernment of Mexico, July, 1st. 1870 and his report on the subject of a Ship Canal Across the Isthmus of Tehuantepec, to unite the Atlantic and Pacific Oceans /

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