Charts. Coatzacoalcos River, east coast of Mexico, from survey by U. S. Tehuantepec Expedition in 1870 and 1871. with corrections to 1933, scale naut. m.=1 in., natural scale 1:72,387; Puerto Mexico (Coatzacoalcos), from plans by Tehuantepec National Railway, 1908, with corrections to 1933, scale naut. m.=4.6 in., natural scale 1:16,000; chart 1048.