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. 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, principal assistant engineer.