GIS on the World Wide Web
Data sources:
Geography Network: http://www.geographynetwork.com/
Illinois Natural Resources Spatial Data Clearinghouse: http://www.isgs.uiuc.edu/nsdihome/ISGSindex.html
GeoCommunicator (searchable database): http://www.geocommunicator.gov/
Geographic Coordinate Database (for PLSS coordinates): http://www.blm.gov/gcdb/
Internet Map Servers (on-line GIS interface):
U.S. Census: http://tiger.census.gov/cgi-bin/mapbrowse-tbl
National Geographic Maps: http://www.nationalgeographic.com/maps/
USEPA Enviromapper: http://www.epa.gov/enviro/html/em/index.html
On-line Natural Hazard Maps: http://www.esri.com/hazards/makemap.html
Wild Fire Maps: http://geomac.usgs.gov/
U.S. HUD e-maps: http://www.hud.gov/offices/cio/emaps/index.cfm
Drought Map http://drought.unl.edu/dm/
Other Resources:
Map Cruzin: http://www.mapcruzin.com/index.html