Columbia subject headings:
Railroads--Mexico.
Tehuantepec, Isthmus of (Mexico)
Harvard subject headings:
Garay, José de, 1801-1858.
Railroads--Mexico
Tehuantepec Canal (Mexico)
Tehuantepec, Isthmus of (Mexico)
Transportation--Mexico--Tehuantepec, Isthmus of.
Princeton subject headings:
Railroads--Mexico.
Tehuantepec, Isthmus of (Mexico)