1863. Berghaus, Hermann, 1828-1890. Relief shown by hachures. Includes 8 inset maps and abbreviation table. " ... containing the lines of oceanic mail steam communication and overland... Gotha : Justus Perthes, [1863].
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1907. United States. Dept. of Commerce and Labor. Bureau of Statistics. "Vessel routes shown upon the high seas represent the tracks usually followed by the various steamship lines passing between the ports indicated." ... [Washington, D.C. : Dept. of Commerce and Labor, Bureau of Statistics], 1907.