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![Schematic of the world's ocean currents](http://upload.wikimedia.org/wikipedia/commons/thumb/6/67/Ocean_currents_1943_%28borderless%293.png/500px-Ocean_currents_1943_%28borderless%293.png)
Ocean Currents and Sea Ice from Atlas of World Maps, a 1943 United States military map of world ocean currents and ice packs, as they were known at the time.