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Plan of that part of the Isthmus of Tehuantepec between the Jaltepec River & the Pacific Plains; embracing all the engineering difficulties on the route of survey. Profile on the land as surveyed, 1851.

Map of the River Uspanapa to the Playa Del Tigre, May 1851. Tehuantepec survey by J.G. Major Barnard.

Chart of the entrance & channel of the Boca-Barra according to the survey made in November 1850 for the Tehuantepec Rail Road Company, New Orleans.

Chart of the Ports of Laventosa & Salina Cruz according to the survey made in 1850 for the Tehuantepec Rail Road Company, New Orleans. October 11, 1851.