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July 3, 2014

USGS Historical Topographic Map Explorer

USGS Historical Topographic Map Explorer

February 8, 2013

Mercator Puzzle!

http://gmaps-samples.googlecode.com/svn/trunk/poly/puzzledrag.html

October 18, 2012

Last Frontier Historical Topographic Maps

Last Frontier Historical Topographic Maps

from the site:


The U.S. Geological Survey announces it is now possible to see the topography and geography of Alaska in an extensive set of topographic maps dating back to 1899. This recent addition to the Historical Topographic Map Collection provides a comprehensive landscape repository of our northernmost State and shows changes through time, providing essential clues critical in the understanding our Nation's development.