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USGS NAWQA Digital Maps - http://water.usgs.gov/nawqa/digmap.html
National Water-Quality Assessment provides digital maps for a variety of themes. |
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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. |
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Geologic Data Systems - http://www.geologicdata.com
Works with petroleum companies to make precise geological maps. |
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GeoGraphics - http://www.btinternet.com/~simon_tapper/index.html
Provides custom maps, drawings, and technical illustrations. Provides links to publications and images. |