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Inland Waters
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Drainage
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Hydrology
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2009
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1. North America: Drainage Directions, 15s resolution, 2009
2009. World Wildlife Fund (WWF). This drainage direction map for North America defines the direction of flow from each cell in the conditioned digital elevation model to its steepe... U.S. Geological Survey.
2. North America: Drainage Directions, 30s resolution, 2009
2009. World Wildlife Fund (WWF). This drainage direction map for North America defines the direction of flow from each cell in the conditioned digital elevation model to its steepe... U.S. Geological Survey.