Links to GIS Sources
GIS.com
http://www.gis.com
National Center for Health Statistics (NCHS) Public Health and GIS
http://www.cdc.gov/gis/
Central Texas GIS
http://centexgis.org/
Google Earth
http://earth.google.com/
US Geological Survey GIS
http://erg.usgs.gov/isb/pubs/gis_poster/