The isthmus of Tehuantepec : being the results of a survey for a railroad to connect the Atlantic and Pacific oceans made by the scientific commission under the direction of Major J. G. Barnard, U.S. engineers : with a résumé of the geology, climate, local geography, productive industry, fauna and flora of that region / arranged and prepared for the Tehuantepec Railroad Company of New Orleans by J. J. Williams, ..