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Introduction to Geographic Information Systems, 3/e
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ArcGis 8.1 Data Sets
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Viewsheds and Watersheds
Web Links
U.S. Clean Water Act
( http://www.epa.gov/watertrain/cwa/ )
Watershed Boundary Dataset
( http://www.ncgc.nrcs.usda.gov/branch/gdb/products/watershed/index.html )
Hydrologic Engineering Center (HEC) of the U.S. Army Corps of Engineers: Hydrologic Model...
( http://www.hec.usace.army.mil/ )
USGS National Water Information System
( http://nwis.waterdata.usgs.gov/nwis )
GIS Data Depot
( http://www.geocomm.com )
Federal Standards for Delineation of Hydrologic Unit Boundaries
( http://water.usgs.gov/wicp/acwi/spatial/index.html )
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