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University of Connecticut: The Geographer's Craft: Map Projection Overview
An advanced overview of map projections with illustrative graphics. Created by Peter H. Dana, Department of Geography, University of Texas at Austin in 1995.
Rice University
Rice University: Cynthia Lanius: Mathematics of Cartography: Projections
Understanding map projections is an important map-reading skill. Features graphics and links to examples of many different projections and an activity on making a Mercator projection.