- Geologic Data Systems - http://www.gdata.com/
Works with petroleum companies to make precise geological maps.
- Geology of Greenland Map Series - http://www.geus.dk/departments/geol-mapping/map-cd-rom/gr-map-cd-rom-uk.htm
Geological survey of Denmark and Greenland. All maps are compiled on CD.
- USGS NAWQA Digital Maps - http://water.usgs.gov/nawqa/digmap.html
National Water-Quality Assessment provides digital maps for a variety of themes.
- GeoGraphics - http://www.btinternet.com/~simon_tapper/index.html
Provides custom maps, drawings, and technical illustrations. Provides links to publications and images.
- Geological Maps on the Web - http://geomaps.geo.ku.edu/
Access several maps of California online. Find and download the most current maps available.
- USGS - http://geography.usgs.gov/products.html
National mapping information. Provides interactive information and mapping products.
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