A primer on GIS hosted by Queens University Belfast. There is a general introduction to GIS, plus an introduction to Arc/INFO, plus a list of other sites that treat GIS in their own unique and wonderful ways.
A tutorial on GIS, emphasizing Idrisi, by Eric Lorup at the University of Salzburg, Austria.
A tutorial in environmental GIS and remote sensing, emphasizing GRASS, is hosted by David Harbor of Washington and Lee University. (Actually, this is the website home for a semester course in this topic.)
A tutorial on GIS, emphasizing Arc/INFO and the Austin Carey Forest, is hosted by the University of Florida.
A tutorial on GIS, emphasizing Arc/INFO, and based on the book "Understanding GIS: The Arc/INFO Method" is hosted by the University of California at Davis.
An introductory primer on GIS by the U. S. Geological Survey (scan down the page past the introductory materials to reach the primer.) Note that this widely cross-linked tutorial has been passed in detail by the tutorials noted above.
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