GeoGraphics
   Provides custom maps, drawings, and technical illustrations. Provides links to publications and images.
   http://www.btinternet.com/~simon_tapper/index.html

Geologic Data Systems
   Works with petroleum companies to make precise geological maps.
   http://www.gdata.com/

Geology of Greenland Map Series
   Geological survey of Denmark and Greenland. All maps are compiled on CD.
   http://www.geus.dk/departments/geol-mapping/map-cd-rom/gr-map-cd-rom-uk.htm

USGS NAWQA Digital Maps
   National Water-Quality Assessment provides digital maps for a variety of themes.
   http://water.usgs.gov/nawqa/digmap.html