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http://gos2.geodata.gov/wps/portal/gos http://gos2.geodata.gov/wps/portal/gos
http://www.lib.virginia.edu/scholarslab/resources/gis/vagaz/index.htmlhttp://www.lib.virginia.edu/scholarslab/resources/gis/vagaz/index.html
http://www.personal.psu.edu/cab38/ColorBrewer/ColorBrewer_intro.htmlhttp://www.personal.psu.edu/cab38/ColorBrewer/ColorBrewer_intro.html