Useful links
GEOHYDROLOLGY:
www.gwdwc.co.za
www.dwaf.gov.za/groundwater
www.iah.org
www.groundwater.com
www.groundwater.org
www.epa.gov/safewater
GEOGRAPHIC INFORMATION SYSTEMS (GIS):
www.esri-southafrica.com
www.esri.com
www.gis.com
www.geographynetwork.com
www.fgdc.gov
www.geospatial.intergraph.com