Geo.Data.gov - http://geo.data.gov/geoportal/catalog/main/home.page
USDA Geospatial Data Gateway- http://datagateway.nrcs.usda.gov/
USGS Seamless - http://seamless.usgs.gov/
GeoCommunity - http://data.geocomm.com/
EPA - http://www.epa.gov/geospatial/data.html
Great Lakes Coastal Planning - http://aqua.wisc.edu/cpr/Default.aspx?tabid=85
TNRIS - http://www.tnris.state.tx.us/DataCatalog/Index.aspx
North Carolina One Map - http://www.nconemap.com/
Minnesota - http://deli.dnr.state.mn.us/data_search.html
California - http://atlas.ca.gov/download.html
ArcGIS Online - http://www.arcgis.com/home/
National Hydrography Dataset - http://www.horizon-systems.com/nhdplus/data.php
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