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11. North America: Flow Accumulation, 15s resolution, 2009

2009. World Wildlife Fund (WWF). HydroSHEDS (Hydrological data and maps based on SHuttle Elevation Derivatives at multiple Scales)flow accumulation maps define amount of upstream a... U.S. Geological Survey.

12. North America: Flow Accumulation, 30s resolution, 2009

2009. World Wildlife Fund (WWF). HydroSHEDS (Hydrological data and maps based on SHuttle Elevation Derivatives at multiple Scales)flow accumulation maps define amount of upstream a... U.S. Geological Survey.

13. Hydro (Polygon) Douglas County, Wisconsin, 2009

2009. Douglas County Land Records Department/City of Superior GIS. This polygon data layer represents hydrography for Douglas County, Wisconsin in 2009.[Douglas County Lakes/Waterbodies and Lakes Classifications].