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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.
Enchanted Learning
Enchanted Learning: Types of Maps
Enchanted Learning provides an easy-to-understand explanation of projections. Site also provides a graph of related terms such as conic projection, cylindrical projection, Mercator projection, and more.