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View Resource The National Map: The Nation's Topographic Map for the 21st Century

Described as The Nation's Topographic Map for the 21st Century, the National Map "will be a seamless, continuously maintained set of public domain geographic base information that will serve as a foundation for integrating, sharing, and using other data easily and consistently." The USGS site explains why such a program is needed -- including the agencies role; their vision for the project; its...

https://nationalmap.gov/
View Resource NOAA Central Library: Historical Maps and Charts

The mission of the NOAA Library and Information Services is to ensure the delivery of scientific, technical, and legislative information to users, including NOAA staff, the general public, academia, industry, and other government agencies. The library's Historical Maps and Charts Web site contains over 20,000 maps and charts from the late 1700s to the present, some of the nation's earliest...

https://www.nauticalcharts.noaa.gov/csdl/ctp/abstract.htm
View Resource Map and Geographic Information Center: University of Connecticut

Map libraries are a common feature of many large public universities across the country, and the Map and Geographic Information Center at the University of Connecticut is part of this tradition. Bringing together a combination of current US Geological Survey maps and historical maps of importance, their site is a good place for geographers and other such persons seeking detailed spatial...

http://magic.lib.uconn.edu/