Charts. Mexico, West coast of, from Mazatlan to Tenacatita Bay, original survey by U. S. S. Narragansett in 1873-75, scale 1° lat.=6.3 in.; with inset, Revilla Gigedo Islands, original survey by U. S. S. Narragansett 1873, scale 1° lat.=1.6 in.; chart 622.