Putnam, G. R. (George Rockwell), b. 1865 · New York, J. Wiley & Sons; [etc.] · leaf 32
Europeangovernments have made nautical surveys in variousparts of the world, largely in connection with their owncolonies, and in recent years much useful work hasbeen done by vessels of the German government. TheUnited States has also beyond its own territory madevaluable additions to hydrographic… … Progress of Hydrographic Surveys 17 Extension of maritime surveys. Of the total area ofthe earths surface, 51,886,000 square miles is land and145,054,000 square miles is sea. The oceans thusoccupy nearly three-fourths of the whole surface, afford-ing highways open to the nations. To conduct…
Nautical charts
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