Happy 503rd Birthday, Gerardus Mercator (1512-1594).
Learn about the map projections USGS uses, and the various advantages and disadvantages of each. There is no "best" projection. The mapmaker must select the one best suited to the needs, reducing distortion of the most important features.
http://egsc.usgs.gov/isb//
A pdf of the color poster is online here:http://store.usgs.gov/
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