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Environmental Systems Research Institute, Inc. (ESRI) [on-line].  2002.  ESRI--GIS & Mapping Software.  http://www.esri.com/index.html

Geography Network [on-line].  2002.  Data--geographic data for your mapping system.  http://www.geographynetwork.com/data/

GIS.com [on-line].  2002.  Data for your GIS - Links to Data Sources.  http://www.gis.com/data/data_sources.html

SBC Southwestern Bell.  2001.  Greater Austin Yellow Pages and Business White Pages.  Austin, TX: Southwestern Bell.

Yahoo! [on-line].  2002.  Yahoo! Search Engine.  http://www.yahoo.com/