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1787. Rumsey, David, 1944- and Kitchin, Thomas. This layer is a georeferenced image of a map of South America originally created by Thomas Kitchin in 1787. The original map appears in "A general ... Cartography Associates.
2006. World Wildlife Fund (WWF). This drainage direction map for South America defines the direction of flow from each cell in the conditioned digital elevation model to its steepe... U.S. Geological Survey.
2006. World Wildlife Fund (WWF). This drainage direction map for South America defines the direction of flow from each cell in the conditioned digital elevation model to its steepe... U.S. Geological Survey.