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A glorious map of North America, based upon De Vaugondy's maps of 1764 and 1772, which show an archipelagic NW Coast of America, various interesting rivers in the Western Interior and an unusual projection of the West Coast.The drainage of the Mississippi is also very unusual. Diderot's maps were intended to further an understanding of the Western Coast of America, and NE Asia, during a time period immediately prior to Cook's first voyage where numerous theories abounded on these regions, especially the NW Coast of America.